From 34af16092b635efc552660129dfbfc05a803ea1d Mon Sep 17 00:00:00 2001
From: Ulrich Meine <ulrich.meine@web.de>
Date: Sat, 14 Feb 2026 02:40:23 +0100
Subject: [PATCH 1/7] Calculate AWD conditionless; restructured true wind
 calculation for clearer decision tree

---
 lib/obp60task/OBPDataOperations.cpp | 198 +++++++++++++++-------------
 lib/obp60task/OBPDataOperations.h   |  20 +--
 lib/obp60task/obp60task.cpp         |   6 +-
 3 files changed, 119 insertions(+), 105 deletions(-)

diff --git a/lib/obp60task/OBPDataOperations.cpp b/lib/obp60task/OBPDataOperations.cpp
index c968e11..4230a0b 100644
--- a/lib/obp60task/OBPDataOperations.cpp
+++ b/lib/obp60task/OBPDataOperations.cpp
@@ -1,5 +1,4 @@
 #include "OBPDataOperations.h"
-//#include "BoatDataCalibration.h" // Functions lib for data instance calibration
 
 // --- Class CalibrationData ---------------
 CalibrationData::CalibrationData(GwLog* log)
@@ -155,8 +154,7 @@ bool CalibrationData::calibrateInstance(GwApi::BoatValue* boatDataValue)
 
     if (format == "formatWind") { // instance is of type angle
         dataValue = (dataValue * slope) + offset;
-        // dataValue = WindUtils::toPI(dataValue);
-        dataValue = WindUtils::to2PI(dataValue); // we should call <toPI> for format of [-180..180], but pages cannot display negative values properly yet
+        dataValue = WindUtils::to2PI(dataValue); // wind angle data is stored in [0..2PI] format
 
     } else if (format == "formatCourse") { // instance is of type direction
         dataValue = (dataValue * slope) + offset;
@@ -169,7 +167,6 @@ bool CalibrationData::calibrateInstance(GwApi::BoatValue* boatDataValue)
         dataValue = (dataValue * slope) + offset;
     }
 
-
     boatDataValue->value = dataValue; // update boat data value with calibrated value
     calibrationMap[instance].value = dataValue; // store the calibrated value in the list
     calibrationMap[instance].isCalibrated = true;
@@ -247,23 +244,15 @@ void HstryBuf::add(double value)
 
 void HstryBuf::handle(bool useSimuData, CommonData& common)
 {
-    // GwApi::BoatValue* tmpBVal;
     std::unique_ptr<GwApi::BoatValue> tmpBVal; // Temp variable to get formatted and converted data value from OBP60Formatter
 
-    // create temporary boat value for calibration purposes and retrieval of simulation value
-    // tmpBVal = new GwApi::BoatValue(boatDataName.c_str());
-    tmpBVal = std::unique_ptr<GwApi::BoatValue>(new GwApi::BoatValue(boatDataName));
-    tmpBVal->setFormat(boatValue->getFormat());
-    tmpBVal->value = boatValue->value;
-    tmpBVal->valid = boatValue->valid;
-
     if (boatValue->valid) {
-        // Calibrate boat value before adding it to history buffer
-        //calibrationData.calibrateInstance(tmpBVal.get(), logger);
-        //add(tmpBVal->value);
         add(boatValue->value);
-
     } else if (useSimuData) { // add simulated value to history buffer
+        tmpBVal = std::unique_ptr<GwApi::BoatValue>(new GwApi::BoatValue(boatDataName));  // create temporary boat value for retrieval of simulation value
+        tmpBVal->setFormat(boatValue->getFormat());
+        tmpBVal->value = boatValue->value;
+        tmpBVal->valid = boatValue->valid;
         double simSIValue = formatValue(tmpBVal.get(), common).value; // simulated value is generated at <formatValue>; here: retreive SI value
         add(simSIValue);
     } else {
@@ -396,56 +385,75 @@ void WindUtils::addPolar(const double* phi1, const double* r1,
     toPol(&x1, &y1, phi, r);
 }
 
-void WindUtils::calcTwdSA(const double* AWA, const double* AWS,
-    const double* CTW, const double* STW, const double* HDT,
-    double* TWD, double* TWS, double* TWA, double* AWD)
+void WindUtils::calcTwdSA(const double* AWA, const double* AWS, const double* AWD, const double* CTW, const double* STW, const double* HDT,
+    double* TWA, double* TWS, double* TWD)
 {
-    *AWD = *AWA + *HDT;
-    *AWD = to2PI(*AWD);
     double stw = -*STW;
     addPolar(AWD, AWS, CTW, &stw, TWD, TWS);
 
-    // Normalize TWD to [0..360°] (2PI) and TWA to [-180..180] (PI)
+    // Normalize to [0..2PI]
     *TWD = to2PI(*TWD);
-    *TWA = toPI(*TWD - *HDT);
+    *TWA = to2PI(*TWD - *HDT); // for internal storage we normalize wind angle to [0..2PI], as well
 }
 
-double WindUtils::calcHDT(const double* hdmVal, const double* varVal, const double* cogVal, const double* sogVal)
+// calculate HDT from either HDM + VAR, HDM only, or COG
+bool WindUtils::calcHDT(const double* hdmVal, const double* varVal, const double* cogVal, const double* sogVal, double* hdtVal)
 {
-    double hdt;
-    double minSogVal = 0.1; // SOG below this value (m/s) is assumed to be  data noise from GPS sensor
-
-    if (*hdmVal != DBL_MAX) {
-        hdt = *hdmVal + (*varVal != DBL_MAX ? *varVal : 0.0); // Use corrected HDM if HDT is not available (or just HDM if VAR is not available)
-        hdt = to2PI(hdt);
-    } else if (*cogVal != DBL_MAX && *sogVal >= minSogVal) {
-        hdt = *cogVal; // Use COG as fallback if HDT and HDM are not available, and SOG is not data noise
-    } else {
-        hdt = DBL_MAX; // Cannot calculate HDT without valid HDM or HDM+VAR or COG
-    }
-
-    return hdt;
-}
-
-bool WindUtils::calcWinds(const double* awaVal, const double* awsVal,
-    const double* cogVal, const double* stwVal, const double* sogVal, const double* hdtVal,
-    const double* hdmVal, const double* varVal, double* twdVal, double* twsVal, double* twaVal, double* awdVal)
-{
-    double stw, hdt, ctw;
-    double twd, tws, twa, awd;
     double minSogVal = 0.1; // SOG below this value (m/s) is assumed to be  data noise from GPS sensor
 
     if (*hdtVal != DBL_MAX) {
-        hdt = *hdtVal; // Use HDT if available
+        // HDT already available-> nothing to do
+        return true;
+    }
+
+    if (*hdmVal != DBL_MAX) {
+        *hdtVal = *hdmVal + (*varVal != DBL_MAX ? *varVal : 0.0); // Use corrected HDM if HDT is not available (or just HDM if VAR is not available)
+        *hdtVal = to2PI(*hdtVal);
+    } else if (*cogVal != DBL_MAX && *sogVal >= minSogVal) {
+        *hdtVal = *cogVal; // Use COG as fallback if HDT and HDM are not available, and SOG is not data noise
     } else {
-        hdt = calcHDT(hdmVal, varVal, cogVal, sogVal);
+        *hdtVal = DBL_MAX; // Cannot calculate HDT without valid HDM or HDM+VAR or COG
+        return false;
+    }
+    //LOG_DEBUG(GwLog::DEBUG, "WindUtils:calcHDT: HDT: %.1f, HDM %.1f, VAR %.1f, COG %.1f, SOG %.1f", *hdtVal * RAD_TO_DEG, *hdmVal * RAD_TO_DEG, *varVal * RAD_TO_DEG,
+    //     *cogVal * RAD_TO_DEG, *sogVal * 3.6 / 1.852);
+
+    return true;
+}
+
+// calculate wind direction (either TWD or AWD) from wind angle (TWA or AWA) and HDT
+bool WindUtils::calcWD(const double* waVal, const double* hdtVal, double* wdVal)
+{
+    if (*waVal != DBL_MAX && *hdtVal != DBL_MAX) {
+        *wdVal = *waVal + *hdtVal;
+        *wdVal = to2PI(*wdVal);
+    } else {
+        *wdVal = DBL_MAX; // Cannot calculate wind direction WD without valid wind angle WA and HDT
+        return false;
+    }
+
+    return true;
+}
+
+// calculate full set of true winds (TWA, TWS, TWD) apparent winds and more data
+bool WindUtils::calcTrueWinds(const double* awaVal, const double* awsVal, const double* awd,
+    const double* cogVal, const double* stwVal, const double* sogVal, const double* hdtVal,
+    double* twaVal, double* twsVal, double* twdVal)
+{
+    double stw, ctw;
+    double twd, tws, twa;
+    double minSogVal = 0.1; // SOG below this value (m/s) is assumed to be  data noise from GPS sensor
+
+    if ((*awaVal == DBL_MAX) || (*awsVal == DBL_MAX)) {
+        // Cannot calculate true winds at all without valid AWA, AWS
+        return false;
     }
 
     if (*cogVal != DBL_MAX && *sogVal >= minSogVal) { // if SOG is data noise, we don't trust COG
 
         ctw = *cogVal; // Use COG for CTW if available
     } else {
-        ctw = hdt; // 2nd approximation for CTW; hdt must exist if we reach this part of the code
+        ctw = *hdtVal; // 2nd approximation for CTW; HDT must exist if we reach this part of code
     }
 
     if (*stwVal != DBL_MAX) {
@@ -456,28 +464,21 @@ bool WindUtils::calcWinds(const double* awaVal, const double* awsVal,
         // If STW and SOG are not available, we cannot calculate true wind
         return false;
     }
-    // LOG_DEBUG(GwLog::DEBUG, "WindUtils:calcWinds: HDT: %.1f, CTW %.1f, STW %.1f", hdt, ctw, stw);
+    //LOG_DEBUG(GwLog::DEBUG, "WindUtils:calcTrueWinds: HDT: %.1f, CTW %.1f, STW %.1f", *hdtVal * RAD_TO_DEG, ctw * RAD_TO_DEG, stw * 3.6 / 1.852);
 
-    if ((*awaVal == DBL_MAX) || (*awsVal == DBL_MAX)) {
-        // Cannot calculate true wind without valid AWA, AWS; other checks are done earlier
-        return false;
-    } else {
-        calcTwdSA(awaVal, awsVal, &ctw, &stw, &hdt, &twd, &tws, &twa, &awd);
-        *twdVal = twd;
-        *twsVal = tws;
-        *twaVal = twa;
-        *awdVal = awd;
+    calcTwdSA(awaVal, awsVal, awd, &ctw, &stw, hdtVal, &twa, &tws, &twd);
+    *twaVal = twa;
+    *twsVal = tws;
+    *twdVal = twd;
 
-        return true;
-    }
+    return true;
 }
 
 // Calculate true wind data and add to obp60task boat data list
-bool WindUtils::addWinds()
+bool WindUtils::handleWinds(bool calcWinds)
 {
-    double twd, tws, twa, awd, hdt;
+    double twd, tws, twa, awd;
     bool twCalculated = false;
-    bool awdCalculated = false;
 
     double awaVal = awaBVal->valid ? awaBVal->value : DBL_MAX;
     double awsVal = awsBVal->valid ? awsBVal->value : DBL_MAX;
@@ -487,49 +488,62 @@ bool WindUtils::addWinds()
     double hdtVal = hdtBVal->valid ? hdtBVal->value : DBL_MAX;
     double hdmVal = hdmBVal->valid ? hdmBVal->value : DBL_MAX;
     double varVal = varBVal->valid ? varBVal->value : DBL_MAX;
-    //LOG_DEBUG(GwLog::DEBUG, "WindUtils:addWinds: AWA %.1f, AWS %.1f, COG %.1f, STW %.1f, SOG %.2f, HDT %.1f, HDM %.1f, VAR %.1f", awaBVal->value * RAD_TO_DEG, awsBVal->value * 3.6 / 1.852,
-    //     cogBVal->value * RAD_TO_DEG, stwBVal->value * 3.6 / 1.852, sogBVal->value * 3.6 / 1.852, hdtBVal->value * RAD_TO_DEG, hdmBVal->value * RAD_TO_DEG, varBVal->value * RAD_TO_DEG);
+    double twaVal = twaBVal->valid ? twaBVal->value : DBL_MAX;
+    double twsVal = twsBVal->valid ? twsBVal->value : DBL_MAX;
+    //LOG_DEBUG(GwLog::DEBUG, "WindUtils:handleWinds: AWA %.1f, AWS %.1f, AWD %.1f, COG %.1f, STW %.1f, SOG %.2f, HDT %.1f, HDM %.1f, VAR %.1f", awaVal * RAD_TO_DEG, awsVal * 3.6 / 1.852,
+    //    awd * RAD_TO_DEG, cogVal * RAD_TO_DEG, stwVal * 3.6 / 1.852, sogVal * 3.6 / 1.852, hdtVal * RAD_TO_DEG, hdmVal * RAD_TO_DEG, varVal * RAD_TO_DEG);
 
-    // Check if TWD can be calculated from TWA and HDT/HDM
-    if (twaBVal->valid) {
-        if (!twdBVal->valid) {
-            if (hdtVal != DBL_MAX) {
-                hdt = hdtVal; // Use HDT if available
-            } else {
-                hdt = calcHDT(&hdmVal, &varVal, &cogVal, &sogVal);
-            }
-            twd = twaBVal->value + hdt;
-            twd = to2PI(twd);
+    if (calcHDT(&hdmVal, &varVal, &cogVal, &sogVal, &hdtVal)) {
+        hdtBVal->value = hdtVal;
+        hdtBVal->valid = true;
+    } else {
+        // determination of HDT was not possible due to missing prerequisite data
+        hdtBVal->valid = false;
+        return false;
+    }
+
+    // calculate AWD if not existing and if possible
+    if (!awdBVal->valid) {
+        if (calcWD(&awaVal, &hdtVal, &awd)) {
+            awdBVal->value = awd;
+            awdBVal->valid = true;
+        } else {
+            awdBVal->valid = false;
+            return false;
+        }
+    }
+    
+    // calculate TWD if not existing and if possible
+    if (!twdBVal->valid) {
+        // calculate TWD if it does not exist yet and TWA is available
+        if (calcWD(&twaVal, &hdtVal, &twd)) {
             twdBVal->value = twd;
             twdBVal->valid = true;
+        } else {
+            twdBVal->valid = false;
         }
+    }
 
-    } else {
-        // Calculate true winds and AWD; if true winds exist, use at least AWD calculation
-        twCalculated = calcWinds(&awaVal, &awsVal, &cogVal, &stwVal, &sogVal, &hdtVal, &hdmVal, &varVal, &twd, &tws, &twa, &awd);
-
+    if (calcWinds && (!twaBVal->valid || !twsBVal->valid || !twdBVal->valid)) {
+        // calculate true winds if user setting and at least one of three true wind values does not exist
+        twCalculated = calcTrueWinds(&awaVal, &awsVal, &awd, &cogVal, &stwVal, &sogVal, &hdtVal, &twa, &tws, &twd);
         if (twCalculated) { // Replace values only, if successfully calculated and not already available
-            if (!twdBVal->valid) {
-                twdBVal->value = twd;
-                twdBVal->valid = true;
+            if (!twaBVal->valid) {
+                twaBVal->value = twa;
+                twaBVal->valid = true;
             }
             if (!twsBVal->valid) {
                 twsBVal->value = tws;
                 twsBVal->valid = true;
             }
-            if (!twaBVal->valid) {
-                //twaBVal->value = twa;
-                twaBVal->value = to2PI(twa); // convert to [0..360], because pages cannot display negative values properly yet
-                twaBVal->valid = true;
-            }
-            if (!awdBVal->valid) {
-                awdBVal->value = awd;
-                awdBVal->valid = true;
+            if (!twdBVal->valid) {
+                twdBVal->value = twd;
+                twdBVal->valid = true;
             }
         }
     }
-    // LOG_DEBUG(GwLog::DEBUG, "WindUtils:addWinds: twCalculated %d, TWD %.1f, TWA %.1f, TWS %.2f kn, AWD: %.1f", twCalculated, twdBVal->value * RAD_TO_DEG,
-    //     twaBVal->value * RAD_TO_DEG, twsBVal->value * 3.6 / 1.852, awdBVal->value * RAD_TO_DEG);
+    //LOG_DEBUG(GwLog::DEBUG, "WindUtils:handleWinds: twCalculated %d, TWD %.1f, TWA %.1f, TWS %.2f kn, AWD: %.1f", twCalculated, twdBVal->value * RAD_TO_DEG,
+    //    twaBVal->value * RAD_TO_DEG, twsBVal->value * 3.6 / 1.852, awdBVal->value * RAD_TO_DEG);
 
     return twCalculated;
 }
diff --git a/lib/obp60task/OBPDataOperations.h b/lib/obp60task/OBPDataOperations.h
index 9c5b783..d4e41e8 100644
--- a/lib/obp60task/OBPDataOperations.h
+++ b/lib/obp60task/OBPDataOperations.h
@@ -19,7 +19,7 @@ private:
     } tCalibrationData;
 
     std::unordered_map<std::string, tCalibrationData> calibrationMap; // list of calibration data instances
-    std::unordered_map<std::string, double> lastValue; // array for last smoothed values of boat data values
+    std::unordered_map<std::string, double> lastValue; // array for last smoothed value of boat data values
     GwLog* logger;
 
     static constexpr int8_t MAX_CALIBRATION_DATA = 4; // maximum number of calibration data instances
@@ -50,6 +50,7 @@ public:
     void handle(bool useSimuData, CommonData& common);
 };
 
+// Manage history buffer for supported boat data; used by boat data charts
 class HstryBuffers {
 private:
     std::map<String, std::unique_ptr<HstryBuf>> hstryBuffers;
@@ -97,7 +98,8 @@ public:
 class WindUtils {
 private:
     GwApi::BoatValue *twaBVal, *twsBVal, *twdBVal;
-    GwApi::BoatValue *awaBVal, *awsBVal, *awdBVal, *cogBVal, *stwBVal, *sogBVal, *hdtBVal, *hdmBVal, *varBVal;
+    GwApi::BoatValue *awaBVal, *awsBVal, *awdBVal;
+    GwApi::BoatValue *cogBVal, *stwBVal, *sogBVal, *hdtBVal, *hdmBVal, *varBVal;
     static constexpr double DBL_MAX = std::numeric_limits<double>::max();
     GwLog* logger;
 
@@ -128,12 +130,12 @@ public:
     void addPolar(const double* phi1, const double* r1,
         const double* phi2, const double* r2,
         double* phi, double* r);
-    void calcTwdSA(const double* AWA, const double* AWS,
-        const double* CTW, const double* STW, const double* HDT,
-        double* TWD, double* TWS, double* TWA, double* AWD);
-    static double calcHDT(const double* hdmVal, const double* varVal, const double* cogVal, const double* sogVal);
-    bool calcWinds(const double* awaVal, const double* awsVal,
+    void calcTwdSA(const double* AWA, const double* AWS, const double* AWD, const double* CTW, const double* STW, const double* HDT,
+        double* TWA, double* TWS, double* TWD);
+    bool calcHDT(const double* hdmVal, const double* varVal, const double* cogVal, const double* sogVal, double* hdtVal);
+    bool calcWD(const double* waVal, const double* hdtVal, double* wdVal);
+    bool calcTrueWinds(const double* awaVal, const double* awsVal, const double* awd,
         const double* cogVal, const double* stwVal, const double* sogVal, const double* hdtVal,
-        const double* hdmVal, const double* varVal, double* twdVal, double* twsVal, double* twaVal, double* awdVal);
-    bool addWinds();
+        double* twdVal, double* twsVal, double* twaVal);
+    bool handleWinds(bool calcWinds);
 };
\ No newline at end of file
diff --git a/lib/obp60task/obp60task.cpp b/lib/obp60task/obp60task.cpp
index cc825fa..f20bfe6 100644
--- a/lib/obp60task/obp60task.cpp
+++ b/lib/obp60task/obp60task.cpp
@@ -811,11 +811,9 @@ void OBP60Task(GwApi *api){
                 api->getBoatDataValues(boatValues.numValues,boatValues.allBoatValues);
                 api->getStatus(commonData.status);
 
-                if (calcTrueWnds) {
-                    trueWind.addWinds(); // calculate true wind data from apparent wind values
-                }
+                trueWind.handleWinds(calcTrueWnds); // calculate true wind data from apparent wind values
                 calibrationDataList.handleCalibration(&boatValues); // Process calibration for all boat data in <calibrationDataList>
-                hstryBufferList.handleHstryBufs(useSimuData, commonData); // Handle history buffers for certain boat data for windplot page and other usage
+                hstryBufferList.handleHstryBufs(useSimuData, commonData); // Handle history buffers for certain boat data for charts and other usage
 
                 // Clear display
                 // getdisplay().fillRect(0, 0, getdisplay().width(), getdisplay().height(), commonData.bgcolor);

From f21c8da2d2728eace76f8b3ac2c236f9168696f2 Mon Sep 17 00:00:00 2001
From: Ulrich Meine <ulrich.meine@web.de>
Date: Sun, 15 Feb 2026 21:50:20 +0100
Subject: [PATCH 2/7] Clear old code fragments from history buffer class

---
 lib/obp60task/OBPDataOperations.cpp | 39 ++++++++++-------------------
 lib/obp60task/OBPDataOperations.h   |  4 +--
 lib/obp60task/obp60task.cpp         |  3 ++-
 3 files changed, 17 insertions(+), 29 deletions(-)

diff --git a/lib/obp60task/OBPDataOperations.cpp b/lib/obp60task/OBPDataOperations.cpp
index 4230a0b..278ef0e 100644
--- a/lib/obp60task/OBPDataOperations.cpp
+++ b/lib/obp60task/OBPDataOperations.cpp
@@ -249,7 +249,7 @@ void HstryBuf::handle(bool useSimuData, CommonData& common)
     if (boatValue->valid) {
         add(boatValue->value);
     } else if (useSimuData) { // add simulated value to history buffer
-        tmpBVal = std::unique_ptr<GwApi::BoatValue>(new GwApi::BoatValue(boatDataName));  // create temporary boat value for retrieval of simulation value
+        tmpBVal = std::unique_ptr<GwApi::BoatValue>(new GwApi::BoatValue(boatDataName)); // create temporary boat value for retrieval of simulation value
         tmpBVal->setFormat(boatValue->getFormat());
         tmpBVal->value = boatValue->value;
         tmpBVal->valid = boatValue->valid;
@@ -265,20 +265,7 @@ void HstryBuf::handle(bool useSimuData, CommonData& common)
 HstryBuffers::HstryBuffers(int size, BoatValueList* boatValues, GwLog* log)
     : size(size)
     , boatValueList(boatValues)
-    , logger(log)
-{
-
-    // collect boat values for true wind calculation
-    // should all have been already created at true wind object initialization
-    // potentially to be moved to history buffer handling
-    awaBVal = boatValueList->findValueOrCreate("AWA");
-    hdtBVal = boatValueList->findValueOrCreate("HDT");
-    hdmBVal = boatValueList->findValueOrCreate("HDM");
-    varBVal = boatValueList->findValueOrCreate("VAR");
-    cogBVal = boatValueList->findValueOrCreate("COG");
-    sogBVal = boatValueList->findValueOrCreate("SOG");
-    awdBVal = boatValueList->findValueOrCreate("AWD");
-}
+    , logger(log) { };
 
 // Create history buffer for boat data type
 void HstryBuffers::addBuffer(const String& name)
@@ -290,8 +277,6 @@ void HstryBuffers::addBuffer(const String& name)
         return;
     }
 
-    hstryBuffers[name] = std::unique_ptr<HstryBuf>(new HstryBuf(name, size, boatValueList, logger));
-
     // Initialize metadata for buffer
     String valueFormat = bufferParams[name].format; // Data format of boat data type
     // String valueFormat = boatValueList->findValueOrCreate(name)->getFormat().c_str(); // Unfortunately, format is not yet available during system initialization
@@ -300,6 +285,7 @@ void HstryBuffers::addBuffer(const String& name)
     double bufferMinVal = bufferParams[name].bufferMinVal; // Min value for this history buffer
     double bufferMaxVal = bufferParams[name].bufferMaxVal; // Max value for this history buffer
 
+    hstryBuffers[name] = std::unique_ptr<HstryBuf>(new HstryBuf(name, size, boatValueList, logger));
     hstryBuffers[name]->init(valueFormat, hstryUpdFreq, mltplr, bufferMinVal, bufferMaxVal);
     LOG_DEBUG(GwLog::DEBUG, "HstryBuffers: new buffer added: name: %s, format: %s, multiplier: %d, min value: %.2f, max value: %.2f", name, valueFormat, mltplr, bufferMinVal, bufferMaxVal);
 }
@@ -318,8 +304,9 @@ RingBuffer<uint16_t>* HstryBuffers::getBuffer(const String& name)
     auto it = hstryBuffers.find(name);
     if (it != hstryBuffers.end()) {
         return &it->second->hstryBuf;
+    } else {
+        return nullptr;
     }
-    return nullptr;
 }
 // --- End Class HstryBuffers ---------------
 
@@ -415,8 +402,8 @@ bool WindUtils::calcHDT(const double* hdmVal, const double* varVal, const double
         *hdtVal = DBL_MAX; // Cannot calculate HDT without valid HDM or HDM+VAR or COG
         return false;
     }
-    //LOG_DEBUG(GwLog::DEBUG, "WindUtils:calcHDT: HDT: %.1f, HDM %.1f, VAR %.1f, COG %.1f, SOG %.1f", *hdtVal * RAD_TO_DEG, *hdmVal * RAD_TO_DEG, *varVal * RAD_TO_DEG,
-    //     *cogVal * RAD_TO_DEG, *sogVal * 3.6 / 1.852);
+    // LOG_DEBUG(GwLog::DEBUG, "WindUtils:calcHDT: HDT: %.1f, HDM %.1f, VAR %.1f, COG %.1f, SOG %.1f", *hdtVal * RAD_TO_DEG, *hdmVal * RAD_TO_DEG, *varVal * RAD_TO_DEG,
+    //      *cogVal * RAD_TO_DEG, *sogVal * 3.6 / 1.852);
 
     return true;
 }
@@ -464,7 +451,7 @@ bool WindUtils::calcTrueWinds(const double* awaVal, const double* awsVal, const
         // If STW and SOG are not available, we cannot calculate true wind
         return false;
     }
-    //LOG_DEBUG(GwLog::DEBUG, "WindUtils:calcTrueWinds: HDT: %.1f, CTW %.1f, STW %.1f", *hdtVal * RAD_TO_DEG, ctw * RAD_TO_DEG, stw * 3.6 / 1.852);
+    // LOG_DEBUG(GwLog::DEBUG, "WindUtils:calcTrueWinds: HDT: %.1f, CTW %.1f, STW %.1f", *hdtVal * RAD_TO_DEG, ctw * RAD_TO_DEG, stw * 3.6 / 1.852);
 
     calcTwdSA(awaVal, awsVal, awd, &ctw, &stw, hdtVal, &twa, &tws, &twd);
     *twaVal = twa;
@@ -490,8 +477,8 @@ bool WindUtils::handleWinds(bool calcWinds)
     double varVal = varBVal->valid ? varBVal->value : DBL_MAX;
     double twaVal = twaBVal->valid ? twaBVal->value : DBL_MAX;
     double twsVal = twsBVal->valid ? twsBVal->value : DBL_MAX;
-    //LOG_DEBUG(GwLog::DEBUG, "WindUtils:handleWinds: AWA %.1f, AWS %.1f, AWD %.1f, COG %.1f, STW %.1f, SOG %.2f, HDT %.1f, HDM %.1f, VAR %.1f", awaVal * RAD_TO_DEG, awsVal * 3.6 / 1.852,
-    //    awd * RAD_TO_DEG, cogVal * RAD_TO_DEG, stwVal * 3.6 / 1.852, sogVal * 3.6 / 1.852, hdtVal * RAD_TO_DEG, hdmVal * RAD_TO_DEG, varVal * RAD_TO_DEG);
+    // LOG_DEBUG(GwLog::DEBUG, "WindUtils:handleWinds: AWA %.1f, AWS %.1f, AWD %.1f, COG %.1f, STW %.1f, SOG %.2f, HDT %.1f, HDM %.1f, VAR %.1f", awaVal * RAD_TO_DEG, awsVal * 3.6 / 1.852,
+    //     awd * RAD_TO_DEG, cogVal * RAD_TO_DEG, stwVal * 3.6 / 1.852, sogVal * 3.6 / 1.852, hdtVal * RAD_TO_DEG, hdmVal * RAD_TO_DEG, varVal * RAD_TO_DEG);
 
     if (calcHDT(&hdmVal, &varVal, &cogVal, &sogVal, &hdtVal)) {
         hdtBVal->value = hdtVal;
@@ -512,7 +499,7 @@ bool WindUtils::handleWinds(bool calcWinds)
             return false;
         }
     }
-    
+
     // calculate TWD if not existing and if possible
     if (!twdBVal->valid) {
         // calculate TWD if it does not exist yet and TWA is available
@@ -542,8 +529,8 @@ bool WindUtils::handleWinds(bool calcWinds)
             }
         }
     }
-    //LOG_DEBUG(GwLog::DEBUG, "WindUtils:handleWinds: twCalculated %d, TWD %.1f, TWA %.1f, TWS %.2f kn, AWD: %.1f", twCalculated, twdBVal->value * RAD_TO_DEG,
-    //    twaBVal->value * RAD_TO_DEG, twsBVal->value * 3.6 / 1.852, awdBVal->value * RAD_TO_DEG);
+    // LOG_DEBUG(GwLog::DEBUG, "WindUtils:handleWinds: twCalculated %d, TWD %.1f, TWA %.1f, TWS %.2f kn, AWD: %.1f", twCalculated, twdBVal->value * RAD_TO_DEG,
+    //     twaBVal->value * RAD_TO_DEG, twsBVal->value * 3.6 / 1.852, awdBVal->value * RAD_TO_DEG);
 
     return twCalculated;
 }
diff --git a/lib/obp60task/OBPDataOperations.h b/lib/obp60task/OBPDataOperations.h
index d4e41e8..5631483 100644
--- a/lib/obp60task/OBPDataOperations.h
+++ b/lib/obp60task/OBPDataOperations.h
@@ -32,6 +32,7 @@ public:
     bool smoothInstance(GwApi::BoatValue* boatDataValue); // Smooth single boat data value
 };
 
+// Class for a single history buffer of boat values
 class HstryBuf {
 private:
     RingBuffer<uint16_t> hstryBuf; // Circular buffer to store history values
@@ -50,14 +51,13 @@ public:
     void handle(bool useSimuData, CommonData& common);
 };
 
-// Manage history buffer for supported boat data; used by boat data charts
+// Manage list of history buffers for supported boat data; used by boat data charts
 class HstryBuffers {
 private:
     std::map<String, std::unique_ptr<HstryBuf>> hstryBuffers;
     int size; // size of all history buffers
     BoatValueList* boatValueList;
     GwLog* logger;
-    GwApi::BoatValue *awaBVal, *hdtBVal, *hdmBVal, *varBVal, *cogBVal, *sogBVal, *awdBVal; // boat values for true wind calculation
 
     struct HistoryParams {
         int hstryUpdFreq; // update frequency of history buffer (documentation only)
diff --git a/lib/obp60task/obp60task.cpp b/lib/obp60task/obp60task.cpp
index 5db9e58..ec95b6d 100644
--- a/lib/obp60task/obp60task.cpp
+++ b/lib/obp60task/obp60task.cpp
@@ -479,7 +479,8 @@ void OBP60Task(GwApi *api){
             pages[i].parameters.values.push_back(value); 
        }
 
-       // Read the specified boat data types of relevant pages and create a history buffer for each type
+       // Read the specified boat data types of relevant pages and create a history buffer for each type for later use in charts
+       // applies only for pages that uses charts
        if (pages[i].parameters.pageName == "OneValue" || pages[i].parameters.pageName == "TwoValues" || pages[i].parameters.pageName == "WindPlot") {
            for (auto pVal : pages[i].parameters.values) {
                 hstryBufferList.addBuffer(pVal->getName());

From 79aeeed65c0664068fd45045c025992a36782af5 Mon Sep 17 00:00:00 2001
From: Ulrich Meine <ulrich.meine@web.de>
Date: Fri, 20 Feb 2026 23:59:59 +0100
Subject: [PATCH 3/7] Show correct time line on horizontal charts

---
 lib/obp60task/OBPcharts.cpp     | 35 +++++++++++++++++----------------
 lib/obp60task/PageOneValue.cpp  |  2 --
 lib/obp60task/PageTwoValues.cpp |  2 --
 lib/obp60task/PageWindPlot.cpp  |  3 +++
 4 files changed, 21 insertions(+), 21 deletions(-)

diff --git a/lib/obp60task/OBPcharts.cpp b/lib/obp60task/OBPcharts.cpp
index 8ae38ec..c393b7f 100644
--- a/lib/obp60task/OBPcharts.cpp
+++ b/lib/obp60task/OBPcharts.cpp
@@ -434,46 +434,47 @@ Pos Chart::setCurrentChartPoint(const int i, const char direction, const double
 // chart time axis label + lines
 void Chart::drawChrtTimeAxis(const char chrtDir, const int8_t chrtSz, const int8_t chrtIntv)
 {
-    float axSlots, intv, i;
+    int axSlots, intv, i, timeRng;
     char sTime[6];
-    int timeRng = chrtIntv * 4; // chart time interval: [1] 4 min., [2] 8 min., [3] 12 min., [4] 16 min., [8] 32 min.
+    int tOffset;
 
     getdisplay().setFont(&Ubuntu_Bold8pt8b);
     getdisplay().setTextColor(fgColor);
 
-    axSlots = 5; // number of axis labels
-    intv = timAxis / (axSlots - 1); // minutes per chart axis interval (interval is 1 less than axSlots)
-    i = timeRng; // Chart axis label start at -32, -16, -12, ... minutes
+    intv = 60; // print axis label each 60 pixels = seconds
+    axSlots = timAxis / intv; // number of axis labels; value will be truncated to full number
+    i = axSlots * chrtIntv * -1; // current minute label
 
     if (chrtDir == HORIZONTAL) {
         getdisplay().fillRect(0, cRoot.y, dWidth, 2, fgColor);
 
-        for (float j = 0; j < timAxis - 1; j += intv) { // fill time axis with values but keep area free on right hand side for value label
+    LOG_DEBUG(GwLog::DEBUG, "Chart::drawChrtTimeAxis: intv: %d, axSlots: %d, timAxis: %d, chrtIntv: %d", intv, axSlots, timAxis, chrtIntv);
+        for (int j = intv; j < timAxis - 1; j += intv) { // fill time axis with values but keep area free on right hand side for value label
 
             // draw text with appropriate offset
-            int tOffset = j == 0 ? 13 : -4;
-            snprintf(sTime, sizeof(sTime), "-%.0f", i);
+            tOffset = j == 0 ? 13 : -4;
+            snprintf(sTime, sizeof(sTime), "%d", i);
             drawTextCenter(cRoot.x + j + tOffset, cRoot.y - 8, sTime);
             getdisplay().drawLine(cRoot.x + j, cRoot.y, cRoot.x + j, cRoot.y + 5, fgColor); // draw short vertical time mark
 
-            i -= chrtIntv;
+            i += chrtIntv;
         }
 
     } else { // vertical chart
 
         for (float j = intv; j < timAxis - 1; j += intv) { // don't print time label at upper and lower end of time axis
 
-            i -= chrtIntv; // we start not at top chart position
-            snprintf(sTime, sizeof(sTime), "-%.0f", i);
+            snprintf(sTime, sizeof(sTime), "%d", i);
             getdisplay().drawLine(cRoot.x, cRoot.y + j, cRoot.x + valAxis, cRoot.y + j, fgColor); // Grid line
 
             if (chrtSz == FULL_SIZE) { // full size chart
                 getdisplay().fillRect(0, cRoot.y + j - 9, 32, 15, bgColor); // clear small area to remove potential chart lines
                 getdisplay().setCursor((4 - strlen(sTime)) * 7, cRoot.y + j + 3); // time value; print left screen; value right-formated
-                getdisplay().printf("%s", sTime); // Range value
+                getdisplay().printf("%s", sTime); // time value
             } else if (chrtSz == HALF_SIZE_RIGHT) { // half size chart; right side
                 drawTextCenter(dWidth / 2, cRoot.y + j, sTime); // time value; print mid screen
             }
+            i += chrtIntv;
         }
     }
 }
@@ -491,11 +492,11 @@ void Chart::drawChrtValAxis(const char chrtDir, const int8_t chrtSz, bool prntNa
 
         if (chrtSz == FULL_SIZE) {
 
+            // print buffer data name on left hand side of time axis (max. size 5 characters)
             font = &Ubuntu_Bold12pt8b;
-
-            // print buffer data name on right hand side of time axis (max. size 5 characters)
             getdisplay().setFont(font);
-            drawTextRalign(cRoot.x + timAxis, cRoot.y - 3, dbName.substring(0, 5));
+            getdisplay().fillRect(cRoot.x + timAxis - 57, cRoot.y + 2, 58, 20, bgColor); // clear small area to remove potential chart lines
+            drawTextRalign(cRoot.x + timAxis, cRoot.y + 19, dbName.substring(0, 5));
 
             if (chrtDataFmt == WIND) {
                 prntHorizChartThreeValueAxisLabel(font);
@@ -509,11 +510,11 @@ void Chart::drawChrtValAxis(const char chrtDir, const int8_t chrtSz, bool prntNa
         } else { // half size chart -> just print edge values + middle chart line
 
             font = &Ubuntu_Bold10pt8b;
-
             if (prntName) {
                 // print buffer data name on right hand side of time axis (max. size 5 characters)
                 getdisplay().setFont(font);
-                drawTextRalign(cRoot.x + timAxis, cRoot.y - 3, dbName.substring(0, 5));
+                getdisplay().fillRect(cRoot.x + timAxis - 57, cRoot.y + 2, 58, 20, bgColor); // clear small area to remove potential chart lines
+                drawTextRalign(cRoot.x + timAxis, cRoot.y + 16, dbName.substring(0, 5));
             }
 
             prntHorizChartThreeValueAxisLabel(font);
diff --git a/lib/obp60task/PageOneValue.cpp b/lib/obp60task/PageOneValue.cpp
index 78cc6e6..fd9509a 100644
--- a/lib/obp60task/PageOneValue.cpp
+++ b/lib/obp60task/PageOneValue.cpp
@@ -209,8 +209,6 @@ public:
                     dataIntv = 3;
                 } else if (dataIntv == 3) {
                     dataIntv = 4;
-                } else if (dataIntv == 4) {
-                    dataIntv = 8;
                 } else {
                     dataIntv = 1;
                 }
diff --git a/lib/obp60task/PageTwoValues.cpp b/lib/obp60task/PageTwoValues.cpp
index 5990656..eaf25d3 100644
--- a/lib/obp60task/PageTwoValues.cpp
+++ b/lib/obp60task/PageTwoValues.cpp
@@ -211,8 +211,6 @@ public:
                     dataIntv = 3;
                 } else if (dataIntv == 3) {
                     dataIntv = 4;
-                } else if (dataIntv == 4) {
-                    dataIntv = 8;
                 } else {
                     dataIntv = 1;
                 }
diff --git a/lib/obp60task/PageWindPlot.cpp b/lib/obp60task/PageWindPlot.cpp
index da948c2..9e6e879 100644
--- a/lib/obp60task/PageWindPlot.cpp
+++ b/lib/obp60task/PageWindPlot.cpp
@@ -231,6 +231,9 @@ public:
 
         } else if (chrtMode == SPEED) {
             if (wsChart) {
+                if (dataIntv == 8) {
+                    dataIntv = 1; // horizontal charts show max. 4 x 7 min. only; no factor 8 multiplier
+                }
                 wsChart->showChrt(HORIZONTAL, FULL_SIZE, dataIntv, PRNT_NAME, PRNT_VALUE, *wsBVal);
             }
 

From a44572675767d7844e562992d342036e5dbba89e Mon Sep 17 00:00:00 2001
From: Ulrich Meine <ulrich.meine@web.de>
Date: Thu, 26 Mar 2026 21:57:17 +0100
Subject: [PATCH 4/7] Convert class <movingAvg> to accept flexible data types

---
 lib/obp60task/OBPSensorTask.cpp |  4 +-
 lib/obp60task/movingAvg.cpp     | 67 -------------------------
 lib/obp60task/movingAvg.h       | 26 +++++++---
 lib/obp60task/movingAvg.tpp     | 88 +++++++++++++++++++++++++++++++++
 4 files changed, 108 insertions(+), 77 deletions(-)
 delete mode 100644 lib/obp60task/movingAvg.cpp
 create mode 100644 lib/obp60task/movingAvg.tpp

diff --git a/lib/obp60task/OBPSensorTask.cpp b/lib/obp60task/OBPSensorTask.cpp
index 1424907..5d355aa 100644
--- a/lib/obp60task/OBPSensorTask.cpp
+++ b/lib/obp60task/OBPSensorTask.cpp
@@ -66,8 +66,8 @@ void sensorTask(void *param){
     const int avgsize = 300;
     constexpr int arrayBatV{avgsize};
     constexpr int arrayBatC{avgsize};
-    movingAvg batV(arrayBatV);
-    movingAvg batC(arrayBatC);
+    movingAvg<int> batV(arrayBatV);
+    movingAvg<int> batC(arrayBatC);
     batV.begin();
     batC.begin();
 
diff --git a/lib/obp60task/movingAvg.cpp b/lib/obp60task/movingAvg.cpp
deleted file mode 100644
index b9a46ab..0000000
--- a/lib/obp60task/movingAvg.cpp
+++ /dev/null
@@ -1,67 +0,0 @@
-// Arduino Moving Average Library
-// https://github.com/JChristensen/movingAvg
-// Copyright (C) 2018 by Jack Christensen and licensed under
-// GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html
-
-#include <movingAvg.h>
-
-// initialize - allocate the interval array
-void movingAvg::begin()
-{
-    m_readings = new int[m_interval];
-}
-
-// add a new reading and return the new moving average
-int movingAvg::reading(int newReading)
-{
-    // add each new data point to the sum until the m_readings array is filled
-    if (m_nbrReadings < m_interval) {
-        ++m_nbrReadings;
-        m_sum += newReading;
-    }
-    // once the array is filled, subtract the oldest data point and add the new one
-    else {
-        m_sum = m_sum - m_readings[m_next] + newReading;
-    }
-
-    m_readings[m_next] = newReading;
-    if (++m_next >= m_interval) m_next = 0;
-    return (m_sum + m_nbrReadings / 2) / m_nbrReadings;
-}
-
-// just return the current moving average
-int movingAvg::getAvg()
-{
-    return (m_sum + m_nbrReadings / 2) / m_nbrReadings;
-}
-
-// return the average for a subset of the data, the most recent nPoints readings.
-// for invalid values of nPoints, return zero.
-int movingAvg::getAvg(int nPoints)
-{
-    if (nPoints < 1 || nPoints > m_interval || nPoints > m_nbrReadings) {
-        return 0;
-    }
-    else {
-        long sum{0};
-        int i = m_next;
-        for (int n=0; n<nPoints; ++n) {
-            if (i == 0) {
-                i = m_interval - 1;
-            }
-            else {
-                --i;
-            }
-            sum += m_readings[i];
-        }
-        return (sum + nPoints / 2) / nPoints;
-    }
-}
-
-// start the moving average over again
-void movingAvg::reset()
-{
-    m_nbrReadings = 0;
-    m_sum = 0;
-    m_next = 0;
-}
diff --git a/lib/obp60task/movingAvg.h b/lib/obp60task/movingAvg.h
index dadd2c3..1d905d4 100644
--- a/lib/obp60task/movingAvg.h
+++ b/lib/obp60task/movingAvg.h
@@ -3,27 +3,37 @@
 // Copyright (C) 2018 by Jack Christensen and licensed under
 // GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html
 
+// Extended to template class for handling of multiple data types
+
 #ifndef MOVINGAVG_H_INCLUDED
 #define MOVINGAVG_H_INCLUDED
 
+template <typename T>
 class movingAvg
 {
     public:
         movingAvg(int interval)
-            : m_interval{interval}, m_nbrReadings{0}, m_sum{0}, m_next{0} {}
+            : m_interval{interval}, m_nbrReadings{0}, m_sum{0}, m_next{0}, m_readings{nullptr} {}
+        ~movingAvg() { delete[] m_readings; }
         void begin();
-        int reading(int newReading);
-        int getAvg();
-        int getAvg(int nPoints);
-        int getCount() {return m_nbrReadings;}
+        T reading(T newReading);
+        T getAvg();
+        T getAvg(int nPoints);
+        int getCount() { return m_nbrReadings; }
         void reset();
-        int* getReadings() {return m_readings;}
+        T* getReadings() { return m_readings; }
 
     private:
         int m_interval;     // number of data points for the moving average
         int m_nbrReadings;  // number of readings
-        long m_sum;         // sum of the m_readings array
+        // Sum type adapts to T: long for integers, T for floating point
+        using SumType = typename std::conditional<std::is_floating_point<T>::value, T, long>::type;
+        SumType m_sum;
         int m_next;         // index to the next reading
-        int* m_readings;    // pointer to the dynamically allocated interval array
+        T* m_readings;      // pointer to the dynamically allocated interval array
 };
+
+// Include the implementation to satisfy template instantiation requirements
+#include "movingAvg.tpp"
+
 #endif
diff --git a/lib/obp60task/movingAvg.tpp b/lib/obp60task/movingAvg.tpp
new file mode 100644
index 0000000..4468ee0
--- /dev/null
+++ b/lib/obp60task/movingAvg.tpp
@@ -0,0 +1,88 @@
+// Arduino Moving Average Library
+// https://github.com/JChristensen/movingAvg
+// Copyright (C) 2018 by Jack Christensen and licensed under
+// GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html
+
+// Extended to template class for handling of multiple data types
+
+//template <typename T>
+//movingAvg<T>::movingAvg(int interval)
+//    : m_interval{interval}, m_nbrReadings{0}, m_sum{0}, m_next{0}, m_readings{nullptr}
+//{}
+
+// initialize - allocate the interval array
+template <typename T>
+void movingAvg<T>::begin()
+{
+    m_readings = new T[m_interval];
+}
+
+// add a new reading and return the new moving average
+template <typename T>
+T movingAvg<T>::reading(T newReading)
+{
+    // add each new data point to the sum until the m_readings array is filled
+    if (m_nbrReadings < m_interval) {
+        ++m_nbrReadings;
+        m_sum += newReading;
+    }
+    // once the array is filled, subtract the oldest data point and add the new one
+    else {
+        m_sum = m_sum - m_readings[m_next] + newReading;
+    }
+
+    m_readings[m_next] = newReading;
+    if (++m_next >= m_interval) m_next = 0;
+    return getAvg();
+}
+
+// just return the current moving average
+template <typename T>
+T movingAvg<T>::getAvg()
+{
+    if (m_nbrReadings == 0) return 0;
+
+    // Apply rounding for integers only
+    if (std::is_floating_point<T>::value) {
+        return m_sum / m_nbrReadings;
+    } else {
+        return (m_sum + (SumType)m_nbrReadings / 2) / m_nbrReadings;
+    }
+}
+
+// return the average for a subset of the data, the most recent nPoints readings.
+// for invalid values of nPoints, return zero.
+template <typename T>
+T movingAvg<T>::getAvg(int nPoints)
+{
+    if (nPoints < 1 || nPoints > m_interval || nPoints > m_nbrReadings) {
+        return 0;
+    }
+
+    SumType sum{0};
+    int i = m_next;
+    for (int n=0; n<nPoints; ++n) {
+        if (i == 0) {
+            i = m_interval - 1;
+        }
+        else {
+            --i;
+        }
+        sum += m_readings[i];
+    }
+
+    if (std::is_floating_point<T>::value) {
+        return sum / nPoints;
+    } else {
+        return (sum + (SumType)nPoints / 2) / nPoints; //
+    }
+}
+
+// start the moving average over again
+template <typename T>
+void movingAvg<T>::reset()
+{
+    m_nbrReadings = 0;
+    m_sum = 0;
+    m_next = 0;
+}
\ No newline at end of file

From 1f0e3cb6eb117e0e314a0125570fdd5a5178009b Mon Sep 17 00:00:00 2001
From: Ulrich Meine <ulrich.meine@web.de>
Date: Thu, 26 Mar 2026 21:58:31 +0100
Subject: [PATCH 5/7] Delete unnecessary include of <movingAvg.h> in some Pages

---
 lib/obp60task/PageBattery2.cpp  | 1 -
 lib/obp60task/PageGenerator.cpp | 1 -
 lib/obp60task/PageSolar.cpp     | 1 -
 lib/obp60task/PageVoltage.cpp   | 1 -
 4 files changed, 4 deletions(-)

diff --git a/lib/obp60task/PageBattery2.cpp b/lib/obp60task/PageBattery2.cpp
index 05ae52e..b691c30 100644
--- a/lib/obp60task/PageBattery2.cpp
+++ b/lib/obp60task/PageBattery2.cpp
@@ -2,7 +2,6 @@
 
 #include "Pagedata.h"
 #include "OBP60Extensions.h"
-#include "movingAvg.h"              // Lib for moving average building
 
 class PageBattery2 : public Page
 {
diff --git a/lib/obp60task/PageGenerator.cpp b/lib/obp60task/PageGenerator.cpp
index 05550cb..9f0b93e 100644
--- a/lib/obp60task/PageGenerator.cpp
+++ b/lib/obp60task/PageGenerator.cpp
@@ -2,7 +2,6 @@
 
 #include "Pagedata.h"
 #include "OBP60Extensions.h"
-#include "movingAvg.h"              // Lib for moving average building
 
 class PageGenerator : public Page
 {
diff --git a/lib/obp60task/PageSolar.cpp b/lib/obp60task/PageSolar.cpp
index e06b95e..4fd20a5 100644
--- a/lib/obp60task/PageSolar.cpp
+++ b/lib/obp60task/PageSolar.cpp
@@ -2,7 +2,6 @@
 
 #include "Pagedata.h"
 #include "OBP60Extensions.h"
-#include "movingAvg.h"              // Lib for moving average building
 
 class PageSolar : public Page
 {
diff --git a/lib/obp60task/PageVoltage.cpp b/lib/obp60task/PageVoltage.cpp
index adf3d28..de467ba 100644
--- a/lib/obp60task/PageVoltage.cpp
+++ b/lib/obp60task/PageVoltage.cpp
@@ -2,7 +2,6 @@
 
 #include "Pagedata.h"
 #include "OBP60Extensions.h"
-#include "movingAvg.h"              // Lib for moving average building
 
 class PageVoltage : public Page
 {

From 3deb80b2c65300a4422cbb6c6db1137cc8d04d02 Mon Sep 17 00:00:00 2001
From: Ulrich Meine <ulrich.meine@web.de>
Date: Thu, 26 Mar 2026 22:08:00 +0100
Subject: [PATCH 6/7] Add smoothing option for any chart plot

---
 lib/obp60task/OBPcharts.cpp     | 31 +++++++++++++++++++++++++++++--
 lib/obp60task/OBPcharts.h       |  5 +++--
 lib/obp60task/PageWindPlot.cpp  |  2 +-
 lib/obp60task/config_obp40.json | 11 +++++++++++
 lib/obp60task/config_obp60.json | 11 +++++++++++
 5 files changed, 55 insertions(+), 5 deletions(-)

diff --git a/lib/obp60task/OBPcharts.cpp b/lib/obp60task/OBPcharts.cpp
index 071007a..d384db8 100644
--- a/lib/obp60task/OBPcharts.cpp
+++ b/lib/obp60task/OBPcharts.cpp
@@ -42,6 +42,11 @@ Chart::Chart(RingBuffer<uint16_t>& dataBuf, double dfltRng, CommonData& common,
     dbMAX_VAL = dataBuf.getMaxVal();
     bufSize = dataBuf.getCapacity();
 
+    smoothCharts = common.config->getBool(common.config->smoothCharts);
+    if (smoothCharts) {
+        chrtAvg.begin();
+    }
+
     // Initialize chart data format; shorter version of standard format indicator
     if (dbFormat == "formatCourse" || dbFormat == "formatWind" || dbFormat == "formatRot") {
         chrtDataFmt = WIND; // Chart is showing data of course / wind <degree> format
@@ -337,6 +342,23 @@ void Chart::drawChartLines(const char direction, const int8_t chrtIntv, const do
     double chrtVal; // Current data value
     Pos point, prevPoint; // current and previous chart point
 
+    if (smoothCharts) {
+        // prime moving average filter to ensure the first plotted point is already averaged
+
+        chrtAvg.reset();
+
+        // Feed the filter the 10 values preceding bufStart
+        for (int p = 10; p > 0; p--) {
+            // Calculate index with wrapping: (start - offset + size) % size
+            int primeIdx = (bufStart - (p * chrtIntv));
+            double primeVal = dataBuf.get(primeIdx);
+            
+            if (primeVal != dbMAX_VAL) {
+                chrtAvg.reading(primeVal);
+            }
+        }
+    }
+
     for (int i = 0; i < (numBufVals / chrtIntv); i++) {
 
         chrtVal = dataBuf.get(bufStart + (i * chrtIntv)); // show the latest wind values in buffer; keep 1st value constant in a rolling buffer
@@ -345,6 +367,11 @@ void Chart::drawChartLines(const char direction, const int8_t chrtIntv, const do
             chrtPrevVal = dbMAX_VAL;
         } else {
 
+            if (smoothCharts) {
+                // if chart lines shall be smoothed, apply moving average filter of the last 10 values
+                chrtVal = chrtAvg.reading(chrtVal);
+            }
+
             point = setCurrentChartPoint(i, direction, chrtVal, chrtScale);
 
             // if (i >= (numBufVals / chrtIntv) - 5) // log chart data of 1 line (adjust for test purposes)
@@ -399,7 +426,7 @@ void Chart::drawChartLines(const char direction, const int8_t chrtIntv, const do
 
             if (chrtDataFmt == WIND) { // degree of course or wind
                 recalcRngMid = true;
-                LOG_DEBUG(GwLog::DEBUG, "PageWindPlot: chart end: timAxis: %d, i: %d, bufStart: %d, numBufVals: %d, recalcRngCntr: %d", timAxis, i, bufStart, numBufVals, recalcRngMid);
+                // LOG_DEBUG(GwLog::DEBUG, "PageWindPlot: chart end: timAxis: %d, i: %d, bufStart: %d, numBufVals: %d, recalcRngCntr: %d", timAxis, i, bufStart, numBufVals, recalcRngMid);
             }
             break;
         }
@@ -454,7 +481,7 @@ void Chart::drawChrtTimeAxis(const char chrtDir, const int8_t chrtSz, const int8
     if (chrtDir == HORIZONTAL) {
         getdisplay().fillRect(0, cRoot.y, dWidth, 2, fgColor);
 
-    LOG_DEBUG(GwLog::DEBUG, "Chart::drawChrtTimeAxis: intv: %d, axSlots: %d, timAxis: %d, chrtIntv: %d", intv, axSlots, timAxis, chrtIntv);
+        // LOG_DEBUG(GwLog::DEBUG, "Chart::drawChrtTimeAxis: intv: %d, axSlots: %d, timAxis: %d, chrtIntv: %d", intv, axSlots, timAxis, chrtIntv);
         for (int j = intv; j < timAxis - 1; j += intv) { // fill time axis with values but keep area free on right hand side for value label
 
             // draw text with appropriate offset
diff --git a/lib/obp60task/OBPcharts.h b/lib/obp60task/OBPcharts.h
index fbdcddd..8978fd3 100644
--- a/lib/obp60task/OBPcharts.h
+++ b/lib/obp60task/OBPcharts.h
@@ -2,6 +2,7 @@
 #pragma once
 #include "Pagedata.h"
 #include "OBP60Extensions.h"
+#include "movingAvg.h"
 
 struct Pos {
     int x;
@@ -44,12 +45,11 @@ protected:
     static constexpr bool NO_SIMUDATA = true; // switch off simulation feature of <formatValue> function
 
     RingBuffer<uint16_t>& dataBuf; // Buffer to display
-    //char chrtDir; // Chart timeline direction: 'H' = horizontal, 'V' = vertical
-    //int8_t chrtSz; // Chart size: [0] = full size, [1] = half size left/top, [2] half size right/bottom
     double dfltRng; // Default range of chart, e.g. 30 = [0..30]
     uint16_t fgColor; // color code for any screen writing
     uint16_t bgColor; // color code for screen background
     bool useSimuData; // flag to indicate if simulation data is active
+    bool smoothCharts; // flag to indicate if charts shall be printed with smoothed gradient
     String tempFormat; // user defined format for temperature
     double zeroValue; // "0" SI value for temperature
 
@@ -84,6 +84,7 @@ protected:
     bool bufDataValid = false; // Flag to indicate if buffer data is valid
     int oldChrtIntv = 0; // remember recent user selection of data interval
 
+    movingAvg<double> chrtAvg{7}; // Store average of the last 7 chart values if chart gradient shall be smoothed
     double chrtPrevVal; // Last data value in chart area
     int x, y; // x and y coordinates for drawing
     int prevX, prevY; // Last x and y coordinates for drawing
diff --git a/lib/obp60task/PageWindPlot.cpp b/lib/obp60task/PageWindPlot.cpp
index 48b8d78..8f6554c 100644
--- a/lib/obp60task/PageWindPlot.cpp
+++ b/lib/obp60task/PageWindPlot.cpp
@@ -37,7 +37,7 @@ private:
     bool oldShowTruW = false; // remember recent user selection of wind data type
 
     int8_t dataIntv = 1; // Update interval for wind history chart:
-                         // (1)|(2)|(3)|(4)|(8) x 240 seconds for 4, 8, 12, 16, 32 min. history chart
+                         // (1)|(2)|(3)|(4)|(8) seconds for up to 32 min. history chart
     bool useSimuData;
     // bool holdValues;
     String flashLED;
diff --git a/lib/obp60task/config_obp40.json b/lib/obp60task/config_obp40.json
index 7d2662d..0926692 100644
--- a/lib/obp60task/config_obp40.json
+++ b/lib/obp60task/config_obp40.json
@@ -230,6 +230,17 @@
             "obp40": "true"
         }
     },
+    {
+        "name": "smoothCharts",
+        "label": "Smooth chart lines",
+        "type": "boolean",
+        "default": "false",
+        "description": "Print chart lines with a smoothed gradient",
+        "category": "OBP40 Settings",
+        "capabilities": {
+            "obp40": "true"
+        }
+    },
     {
         "name": "lengthFormat",
         "label": "Length Format",
diff --git a/lib/obp60task/config_obp60.json b/lib/obp60task/config_obp60.json
index 305688f..a51f1f5 100644
--- a/lib/obp60task/config_obp60.json
+++ b/lib/obp60task/config_obp60.json
@@ -230,6 +230,17 @@
             "obp60": "true"
         }
     },
+    {
+        "name": "smoothCharts",
+        "label": "Smooth chart lines",
+        "type": "boolean",
+        "default": "false",
+        "description": "Print chart lines with a smoothed gradient",
+        "category": "OBP60 Settings",
+        "capabilities": {
+            "obp40": "true"
+        }
+    },
     {
         "name": "lengthFormat",
         "label": "Length Format",

From 530c1014217acb35d73b3ac5ac2c67ae0a52ac57 Mon Sep 17 00:00:00 2001
From: Ulrich Meine <ulrich.meine@web.de>
Date: Thu, 26 Mar 2026 22:27:08 +0100
Subject: [PATCH 7/7] Adjust default ranges for charts

---
 lib/obp60task/OBPcharts.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/obp60task/OBPcharts.cpp b/lib/obp60task/OBPcharts.cpp
index d384db8..eda15e9 100644
--- a/lib/obp60task/OBPcharts.cpp
+++ b/lib/obp60task/OBPcharts.cpp
@@ -6,9 +6,9 @@
 std::map<String, ChartProps> Chart::dfltChrtDta = {
     { "formatWind", { 60.0 * DEG_TO_RAD, 10.0 * DEG_TO_RAD } }, // default course range 60 degrees
     { "formatCourse", { 60.0 * DEG_TO_RAD, 10.0 * DEG_TO_RAD } }, // default course range 60 degrees
-    { "formatKnots", { 7.71, 2.56 } }, // default speed range in m/s
-    { "formatDepth", { 15.0, 5.0 } }, // default depth range in m
-    { "kelvinToC", { 30.0, 5.0 } } // default temp range in °C/K
+    { "formatKnots", { 2.57, 2.57 } }, // default speed range in m/s
+    { "formatDepth", { 10.0, 5.0 } }, // default depth range in m
+    { "kelvinToC", { 20.0, 5.0 } } // default temp range in °C/K
 };
 
 // --- Class Chart ---------------