diff --git a/Makefile b/Makefile
index 30ff7af..b9f7a9c 100644
--- a/Makefile
+++ b/Makefile
@@ -39,6 +39,8 @@ locale/de/LC_MESSAGES/ymsgui.mo: locale/de.po
 
 # Clean generated files
 clean:
+	find . -type d -name "__pycache__" -prune -exec rm -rf {} +
+	find . -type f -name "*.pyc" -delete
 	rm -f locale/program.pot
 	rm -f locale/ui.pot
 	rm -f locale/combined.pot
diff --git a/db/mariadb.sql b/db/mariadb.sql
index b9ea87c..08fd26c 100644
--- a/db/mariadb.sql
+++ b/db/mariadb.sql
@@ -122,7 +122,7 @@ CREATE TABLE storage (
     sname varchar(40) NOT NULL,
     stype tinyint(3) NOT NULL DEFAULT 0, -- ddid=3
     capacity smallint(6) DEFAULT NULL,
-    capaunit enum('kg','l') DEFAULT NULL,
+    capaunit enum('kg','l','pcs') DEFAULT NULL,
     x smallint(6) UNSIGNED NOT NULL DEFAULT 0,
     y smallint(6) NOT NULL DEFAULT 0,
     z smallint(6) NOT NULL DEFAULT 0,
@@ -205,6 +205,9 @@ CREATE TABLE equipment (
     purchdate date DEFAULT NULL,
     price decimal(12,2) DEFAULT NULL,
     weight float(5,2) UNSIGNED DEFAULT NULL,
+    x smallint(6) UNSIGNED NOT NULL DEFAULT 0,
+    y smallint(6) NOT NULL DEFAULT 0,
+    z smallint(6) NOT NULL DEFAULT 0,
     remarks varchar(150) DEFAULT NULL,
     flags set('ordered','removed','deleted') DEFAULT NULL,
     PRIMARY KEY(eid),
@@ -216,7 +219,12 @@ CREATE TABLE equipment (
         ON DELETE RESTRICT,
     FOREIGN KEY fk_equipment_manufacturer (manufacturer)
         REFERENCES company(compid)
-        ON DELETE RESTRICT
+        ON DELETE RESTRICT,
+    CONSTRAINT chk_equipment_pos CHECK (
+        (x IS NULL AND y IS NULL AND z IS NULL)
+        OR
+        (x IS NOT NULL AND y IS NOT NULL AND z IS NOT NULL)
+    )
 ) ENGINE=InnoDB;
 
 CREATE TABLE inventory (
@@ -245,7 +253,7 @@ CREATE TABLE inventory (
     FOREIGN KEY fk_inventory_equipment (eid)
         REFERENCES equipment(eid)
         ON DELETE RESTRICT,
-    CHECK (
+    CONSTRAINT chk_inventory_stor CHECK (
         (sid IS NOT NULL AND boxid IS NULL)
         OR
         (sid IS NULL AND boxid IS NOT NULL)
@@ -306,7 +314,6 @@ CREATE table fuse (
 ) ENGINE=InnoDB;
 
 -- change vals to decimal(12,4)?
--- additional signalk id?
 CREATE TABLE measurement (
     mid smallint(6) NOT NULL AUTO_INCREMENT,
     mname varchar(80) NOT NULL,
@@ -518,7 +525,7 @@ CREATE TABLE checkref (
         ON DELETE CASCADE
 ) ENGINE=InnoDB;
 
-/* Expansion for future use: signalk mapping (just an idea) */
+/* Expansion for future use: signalk mapping (experimental) */
 CREATE TABLE signalk (
     skid int(10) NOT NULL AUTO_INCREMENT,
     vid smallint(6) NOT NULL,
@@ -526,6 +533,7 @@ CREATE TABLE signalk (
     objid int(10) NOT NULL,
     datatype enum('engine_hours','tank_level') NOT NULL,
     skpath varchar(255) NOT NULL,
+    mid smallint(6) DEFAULT NULL,
     PRIMARY KEY (skid),
     UNIQUE KEY ix_signalk
         (vid, objtype, objid, datatype),
diff --git a/db/minimal.sql b/db/minimal.sql
index 9a13a8a..692b5cf 100644
--- a/db/minimal.sql
+++ b/db/minimal.sql
@@ -18,7 +18,8 @@ INSERT INTO settings (userid, sno, valint, valstr) VALUES
 (0, 20, 1280, NULL),  -- Image width limit
 (0, 21, 1024, NULL),  -- Image height limit
 (0, 4, NULL, '€'),    -- Currency symbol
-(0, 5, 0, 'http://127.0.0.1:3000'); -- Signal K: to enable set valint=1
+(0, 5, 0, 'http://127.0.0.1:3000'), -- Signal K: to enable set valint=1
+(0, 6, 0, 'localhost:2597');        -- NMEA2000 (for future use)
 
 /* setting descriptions */
 INSERT INTO settings (userid, sno, valstr) VALUES
@@ -28,6 +29,7 @@ INSERT INTO settings (userid, sno, valstr) VALUES
 (-1, 3, 'user menu'),
 (-1, 4, 'currency symbol e.g. €, $, £, ¥'),
 (-1, 5, 'signalk connection'),
+(-1, 6, 'nmea2000 connection'),
 (-1, 10, 'rows in table'),
 (-1, 20, 'maximum image width'),
 (-1, 21, 'maximum image height'),
diff --git a/db/minimal_en.sql b/db/minimal_en.sql
index 85dd6b4..488302f 100644
--- a/db/minimal_en.sql
+++ b/db/minimal_en.sql
@@ -18,7 +18,8 @@ INSERT INTO settings (userid, sno, valint, valstr) VALUES
 (0, 20, 1280, NULL),  -- Image width limit
 (0, 21, 1024, NULL),  -- Image height limit
 (0, 4, NULL, '€'),    -- Currency symbol
-(0, 5, 0, 'http://127.0.0.1:3000'); -- Signal K: to enable set valint=1
+(0, 5, 0, 'http://127.0.0.1:3000'), -- Signal K: to enable set valint=1
+(0, 6, 0, 'localhost:2597');        -- NMEA2000 (for future use)
 
 /* setting descriptions */
 INSERT INTO settings (userid, sno, valstr) VALUES
@@ -27,6 +28,7 @@ INSERT INTO settings (userid, sno, valstr) VALUES
 (-1, 3, 'user menu'),
 (-1, 4, 'currency symbol e.g. €, $, £, ¥'),
 (-1, 5, 'signalk connection'),
+(-1, 6, 'nmea2000 connection'),
 (-1, 10, 'rows in table'),
 (-1, 20, 'maximum image width'),
 (-1, 21, 'maximum image height'),
diff --git a/webgui/equipment.php b/webgui/equipment.php
index fbbdbfd..783b5f6 100644
--- a/webgui/equipment.php
+++ b/webgui/equipment.php
@@ -75,6 +75,9 @@ switch ($submit = form_get_action()) {
         if ($p[':manufacturer'] <= 0) $p[':manufacturer'] = NULL;
         $p[':ecat'] = gpc_get_int($_POST, 'category');
         if ($p[':ecat'] <= 0) $p[':ecat'] = NULL;
+        $p[':x'] = gpc_get_uint($_POST, 'x');
+        $p[':y'] = gpc_get_int($_POST, 'y');
+        $p[':z'] = gpc_get_int($_POST, 'z');
         $p[':remarks'] = gpc_get_string($_POST, 'remarks', 150);
         $allowed = db_load_enum('equipment', 'flags');
         $p[':flags'] = gpc_get_set($_POST, 'flags', $allowed, true, NULL);
@@ -443,7 +446,8 @@ elseif ($action == ACT_VIEW):
 // ========== VARIANT: view single record =====================================
 
 $sql = "SELECT eid, ename, model, serial, purchdate, price, weight, "
-     . "    supplier, manufacturer, ecat, shortname, remarks, flags "
+     .     "supplier, manufacturer, ecat, shortname, x, y, z, flags, "
+     .     "remarks "
      . "FROM equipment "
      . "WHERE eid=?";
 $sth = $pdo->prepare($sql);
@@ -468,6 +472,9 @@ echo '<tr><th>', _('Price'),"</th><td>", format_currency($equipment->price), "</
 echo '<tr><th>', _('Purchase date'),"</th><td>", format_date($equipment->purchdate), "</td></tr>\n";
 echo '<tr><th>', _('Supplier'),"</th><td>", $equipment->supplier ? $opt_supplier[$equipment->supplier] : 'n/a', "</td></tr>\n";
 echo '<tr><th>', _('Category'),"</th><td>", $opt_ecat[$equipment->ecat], "</td></tr>\n";
+if (!empty($equipment->x)) {
+    echo '<tr><th>', _('Location (x, y, z)'),"</th><td>(", $equipment->x, ', ', $equipment->y, ', ', $equipment->z, ")</td></tr>\n";
+}
 echo '<tr><th>', _('Remarks'),"</th><td>", h($equipment->remarks, br:true), "</td></tr>\n";
 echo '<tr><th>', _('Flags'),"</th><td>", $equipment->flags, "</td></tr>\n";
 echo "</table>\n";
@@ -695,8 +702,8 @@ foreach ($sth->fetchAll() as $row) {
     $supplier[$row['compid']] = $row['compname'];
 }
 
-$sql = "SELECT eid, ename, model, serial, weight, price, purchdate,"
-     . "    supplier, manufacturer, ecat, shortname, remarks, flags "
+$sql = "SELECT eid, ename, model, serial, weight, price, purchdate, "
+     .     "supplier, manufacturer, ecat, shortname, x, y, z, remarks, flags "
      . "FROM equipment "
      . "WHERE eid=?";
 $sth = $pdo->prepare($sql);
@@ -739,6 +746,20 @@ $equipment = $sth->fetch(PDO::FETCH_OBJ);
 form_create_select('supplier', _('Supplier'), $opt_supplier, $equipment->supplier);
 form_create_select('category', _('Category'), $g_opt_unknown + $opt_ecat, $equipment->ecat);
 ?>
+<div class="mb-3">
+  <label class="form-label"><?=_('Position (x, y, z) in mm')?></label>
+  <div class="row">
+    <div class="col">
+      <input type="number" class="form-control" id="x" name="x" min="0" value="<?=$equipment->x ?>">
+    </div>
+    <div class="col">
+      <input type="number" class="form-control" id="y" name="y" value="<?=$equipment->y ?>">
+    </div>
+    <div class="col">
+      <input type="number" class="form-control" id="z" name="z" value="<?=$equipment->z ?>">
+    </div>
+  </div>
+</div>
 <div class="mb-3">
   <label for="remarks" class="form-label"><?=_('Remarks')?></label>
   <textarea class="form-control" id="remarks" name="remarks" rows="3"><?=h($equipment->remarks, br:false)?></textarea>
diff --git a/webgui/lib/db.inc b/webgui/lib/db.inc
index e4741ff..98e7854 100644
--- a/webgui/lib/db.inc
+++ b/webgui/lib/db.inc
@@ -8,17 +8,31 @@
 
 */
 
-function db_get_setting($sno, $default=NULL) {
-    // TODO WIP
+function db_get_setting($sno, $userid, $autocreate=false, $default=NULL) {
     global $pdo;
-    $sql = "SELECT valint, valstr FROM settings WHERE userid=0 AND sno=?";
+    global $g_error;
+    global $g_warning;
+    $sql = "SELECT valint, valstr FROM settings WHERE userid=? AND sno=?";
     $sth = $pdo->prepare($sql);
     try {
-        $sth->execute([$sno]);
+        $sth->execute([$userid, $sno]);
     } catch (Exception $e) {
+        $g_error->Add('SQL-Error: '. $e->getMessage());
+        $g_error->Add($sql);
+        $g_error->Add("userid=$userid,  sno=$sno", true));
+        return $default;
+    }
+    $row = $sth->fetch();
+    if ($row === false) {
+        if ($autocreate) {
+            // create empty settings record if it not exists
+            $p[':userid'] = $userid;
+            $p[':sno'] = $sno;
+            db_exec_insert('settings', $p);
+            $g_warning->Add("Added missing settings record with id=$sno");
+        }
         return $default;
     }
-    $row = $sth->fetchOne();
     return $row;
 }
 
@@ -61,7 +75,6 @@ function db_lock_refresh($token) {
     return $sth->rowCount() === 1;
 }
 
-
 function db_lock_release($token) {
     global $pdo;
     $sql = "DELETE FROM recordlock WHERE token=?";
diff --git a/webgui/lib/gpc.inc b/webgui/lib/gpc.inc
index 0fa16d9..c996710 100644
--- a/webgui/lib/gpc.inc
+++ b/webgui/lib/gpc.inc
@@ -13,7 +13,7 @@
 function gpc_get_string(&$GPC, $varname, $maxlen = NULL, $default = NULL) {
     // TODO Parameter nullval: single value or array of values which considered as null
     //      Default value for nullval is "-1"
-    if (!isset($GPC[$varname]) or (strlen(trim($GPC[$varname])) == 0)) {
+    if (!isset($GPC[$varname]) || (strlen(trim($GPC[$varname])) == 0)) {
         return $default;
     }
     $s = trim($GPC[$varname]);
@@ -24,14 +24,14 @@ function gpc_get_string(&$GPC, $varname, $maxlen = NULL, $default = NULL) {
 }
 
 function gpc_get_int(&$GPC, $varname, $default = NULL) {
-    if (!isset($GPC[$varname])) {
+    if (!isset($GPC[$varname]) || $GPC[$varname] === '') {
         return $default;
     }
     return (int)$GPC[$varname];
 }
 
 function gpc_get_uint(&$GPC, $varname, $default = NULL) {
-    if (!isset($GPC[$varname])) {
+    if (!isset($GPC[$varname]) || $GPC[$varname] === '') {
         return $default;
     }
     $val = (int)$GPC[$varname];
@@ -43,7 +43,7 @@ function gpc_get_uint(&$GPC, $varname, $default = NULL) {
 
 function gpc_get_float(&$GPC, $varname, $default = NULL) {
     global $g_lconv;
-    if (!isset($GPC[$varname]) or (strlen(trim($GPC[$varname])) == 0)) {
+    if (!isset($GPC[$varname]) || (strlen(trim($GPC[$varname])) == 0)) {
         return $default;
     }
     $var = str_replace($g_lconv['thousands_sep'], '', $GPC[$varname]);
@@ -55,7 +55,7 @@ function gpc_get_float(&$GPC, $varname, $default = NULL) {
 
 function gpc_get_currency(&$GPC, $varname, $default = NULL) {
     global $g_lconv;
-    if (!isset($GPC[$varname]) or (strlen(trim($GPC[$varname])) == 0)) {
+    if (!isset($GPC[$varname]) || (strlen(trim($GPC[$varname])) == 0)) {
         return $default;
     }
     $var = str_replace($g_lconv['thousands_sep'], '', $GPC[$varname]);
@@ -132,21 +132,21 @@ function gpc_get_datetime(&$GPC, $varname, $default = NULL) {
 }
 
 function gpc_get_color(&$GPC, $varname, $default = NULL) {
-    if (!isset($GPC[$varname]) or (strlen(trim($GPC[$varname])) == 0)) {
+    if (!isset($GPC[$varname]) || (strlen(trim($GPC[$varname])) == 0)) {
         return $default;
     }
     $color = $GPC[$varname];
-    if ((strlen($color) == 7) and (substr($color, 0, 1) == '#')) {
+    if ((strlen($color) == 7) && (substr($color, 0, 1) == '#')) {
         $color = substr($color, 1);
     }
-    if ((strlen($color) != 6) or (! ctype_xdigit($color))) {
+    if ((strlen($color) != 6) || (! ctype_xdigit($color))) {
         return $default;
     }
     return strtoupper($color);
 }
 
 function gpc_get_enum(&$GPC, $varname, $values, $default = NULL) {
-    if (!isset($GPC[$varname]) or (strlen(trim($GPC[$varname])) == 0)) {
+    if (!isset($GPC[$varname]) || (strlen(trim($GPC[$varname])) == 0)) {
         return $default;
     }
     if (! in_array($GPC[$varname], $values)) {
diff --git a/webgui/storage.php b/webgui/storage.php
index 637b693..9f1d442 100644
--- a/webgui/storage.php
+++ b/webgui/storage.php
@@ -40,7 +40,7 @@ switch ($submit = form_get_action()) {
         $p[':sid'] = $id;
         $p[':sname'] = gpc_get_string($_POST, 'sname');
         $p[':stype'] = gpc_get_string($_POST, 'stype');
-        $p[':x'] = gpc_get_int($_POST, 'x');
+        $p[':x'] = gpc_get_uint($_POST, 'x');
         $p[':y'] = gpc_get_int($_POST, 'y');
         $p[':z'] = gpc_get_int($_POST, 'z');
         $p[':wx'] = gpc_get_int($_POST, 'wx');