diff --git a/lib/boatData/GwBoatData.cpp b/lib/boatData/GwBoatData.cpp
index fba0bee..47cffbf 100644
--- a/lib/boatData/GwBoatData.cpp
+++ b/lib/boatData/GwBoatData.cpp
@@ -1,7 +1,7 @@
 #include "GwBoatData.h"
 
 GwBoatData::GwBoatData(GwLog *logger){
-    
+    this->logger=logger;
 }
 GwBoatData::~GwBoatData(){
     GwBoatItemBase::GwBoatItemMap::iterator it;
diff --git a/lib/boatData/GwBoatData.h b/lib/boatData/GwBoatData.h
index 8eaf3c3..7ff64ac 100644
--- a/lib/boatData/GwBoatData.h
+++ b/lib/boatData/GwBoatData.h
@@ -63,13 +63,14 @@ template<class T> class GwBoatItem : public GwBoatItemBase{
             (*doc)[name]=getData(true);
         }
         private:
-        static GwBoatItem<T> *findOrCreate(GwBoatItemMap *values, String name,bool doCreate=true, 
+        static GwBoatItem<T> *findOrCreate(GwLog *logger,GwBoatItemMap *values, String name,bool doCreate=true, 
             long invalidTime=GwBoatItemBase::INVALID_TIME, Formatter fmt=NULL){
             GwBoatItemMap::iterator it;
             if ((it=values->find(name)) != values->end()){
                 return (GwBoatItem<T> *)it->second;
             }
             if (! doCreate) return NULL;
+            LOG_DEBUG(GwLog::DEBUG,"creating boat data item %s",name.c_str());
             GwBoatItem<T> *ni=new GwBoatItem<T>(invalidTime,fmt);
             (*values)[name]=ni;
             return ni; 
@@ -83,7 +84,7 @@ template<class T> class GwBoatItem : public GwBoatItemBase{
  * */
 #define GWBOATDATA_IMPL_ITEM(type,name) GwBoatItem<type> *get##name##Item(String iname,bool doCreate=true, \
                 long invalidTime=GwBoatItemBase::INVALID_TIME, GwBoatItem<type>::Formatter fmt=NULL){ \
-                return GwBoatItem<type>::findOrCreate(&values,iname, doCreate, \
+                return GwBoatItem<type>::findOrCreate(logger,&values,iname, doCreate, \
                 invalidTime,fmt);\
             }
 
diff --git a/lib/log/GwLog.h b/lib/log/GwLog.h
index 5a24858..1433aa0 100644
--- a/lib/log/GwLog.h
+++ b/lib/log/GwLog.h
@@ -24,6 +24,6 @@ class GwLog{
         void logDebug(int level, const char *fmt,...);
         int isActive(int level){return level <= logLevel;};
 };
-#define LOG_DEBUG(level,...){ if (logger->isActive(level)) logger->logDebug(level,__VA_ARGS__);}
+#define LOG_DEBUG(level,...){ if (logger != NULL && logger->isActive(level)) logger->logDebug(level,__VA_ARGS__);}
 
 #endif
\ No newline at end of file
diff --git a/lib/nmea2kto0183/N2kDataToNMEA0183.cpp b/lib/nmea2kto0183/N2kDataToNMEA0183.cpp
index 039184e..20232fe 100644
--- a/lib/nmea2kto0183/N2kDataToNMEA0183.cpp
+++ b/lib/nmea2kto0183/N2kDataToNMEA0183.cpp
@@ -52,6 +52,7 @@ void N2kDataToNMEA0183::SendMessage(const tNMEA0183Msg &NMEA0183Msg) {
 
 N2kDataToNMEA0183* N2kDataToNMEA0183::create(GwLog *logger, GwBoatData *boatData, tNMEA2000 *NMEA2000, 
     tNMEA0183 *NMEA0183, int sourceId){
+  LOG_DEBUG(GwLog::LOG,"creating N2kToNMEA0183");    
   return new N2kToNMEA0183Functions(logger,boatData,NMEA2000,NMEA0183, sourceId);
 }
 //*****************************************************************************
diff --git a/lib/nmea2kto0183/N2kDataToNMEA0183.h b/lib/nmea2kto0183/N2kDataToNMEA0183.h
index 8207ae5..32727e7 100644
--- a/lib/nmea2kto0183/N2kDataToNMEA0183.h
+++ b/lib/nmea2kto0183/N2kDataToNMEA0183.h
@@ -53,7 +53,7 @@ public:
   }
   virtual void loop();
   virtual ~N2kDataToNMEA0183(){}
-  virtual const unsigned long* handledPgns()=0;
+  virtual unsigned long* handledPgns()=0;
   virtual int numPgns()=0;
   virtual void toJson(JsonDocument &json)=0;
 };
diff --git a/lib/nmea2kto0183/N2kToNMEA0183Functions.h b/lib/nmea2kto0183/N2kToNMEA0183Functions.h
index 3e36991..cf509d8 100644
--- a/lib/nmea2kto0183/N2kToNMEA0183Functions.h
+++ b/lib/nmea2kto0183/N2kToNMEA0183Functions.h
@@ -112,7 +112,7 @@ private:
         ConverterEntry e(converter);
         converters[pgn] = e;
     }
-    virtual const unsigned long *handledPgns()
+    virtual unsigned long *handledPgns()
     {
         logger->logString("CONV: # %d handled PGNS", (int)converters.size());
         unsigned long *rt = new unsigned long[converters.size() + 1];
@@ -145,6 +145,7 @@ private:
         {
             json["cnv"][String(it->first)] = it->second.count;
         }
+        json["aisTargets"]=numShips();
     }
     virtual int numPgns()
     {
@@ -897,11 +898,14 @@ public:
         registerConverter(128275UL, &N2kToNMEA0183Functions::HandleLog);
         registerConverter(127245UL, &N2kToNMEA0183Functions::HandleRudder);
         registerConverter(130310UL, &N2kToNMEA0183Functions::HandleWaterTemp);
+#define HANDLE_AIS 1        
+#ifdef HANDLE_AIS
         registerConverter(129038UL, &N2kToNMEA0183Functions::HandleAISClassAPosReport);  // AIS Class A Position Report, Message Type 1
         registerConverter(129039UL, &N2kToNMEA0183Functions::HandleAISClassBMessage18);  // AIS Class B Position Report, Message Type 18
         registerConverter(129794UL, &N2kToNMEA0183Functions::HandleAISClassAMessage5);   // AIS Class A Ship Static and Voyage related data, Message Type 5
         registerConverter(129809UL, &N2kToNMEA0183Functions::HandleAISClassBMessage24A); // AIS Class B "CS" Static Data Report, Part A
         registerConverter(129810UL, &N2kToNMEA0183Functions::HandleAISClassBMessage24B); // AIS Class B "CS" Static Data Report, Part B
+#endif       
 
     }
     virtual void loop()
diff --git a/lib/nmea2ktoais/NMEA0183AISMessages.cpp b/lib/nmea2ktoais/NMEA0183AISMessages.cpp
index a7b4ed7..aa2c45b 100644
--- a/lib/nmea2ktoais/NMEA0183AISMessages.cpp
+++ b/lib/nmea2ktoais/NMEA0183AISMessages.cpp
@@ -51,6 +51,7 @@ const char Prefix='!';
 
 std::vector<ship *> vships;
 
+int numShips(){return vships.size();}
 // ************************  Helper for AIS  ***********************************
 static bool AddMessageType(tNMEA0183AISMsg &NMEA0183AISMsg, uint8_t MessageType);
 static bool AddRepeat(tNMEA0183AISMsg &NMEA0183AISMsg, uint8_t Repeat);
@@ -250,7 +251,9 @@ bool  SetAISClassBMessage24(tNMEA0183AISMsg &NMEA0183AISMsg, uint8_t MessageID,
     }
   }
   if ( i > MAX_SHIP_IN_VECTOR ) {
-    vships.erase(vships.begin());
+    std::vector<ship *>::iterator it=vships.begin();
+    delete *it;
+    vships.erase(it);
   }
 
   // AIS Type 24 Message
diff --git a/lib/nmea2ktoais/NMEA0183AISMessages.h b/lib/nmea2ktoais/NMEA0183AISMessages.h
index 0c32ac8..e7910cb 100644
--- a/lib/nmea2ktoais/NMEA0183AISMessages.h
+++ b/lib/nmea2ktoais/NMEA0183AISMessages.h
@@ -36,7 +36,7 @@ OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <vector>
 #include <string>
 
-#define MAX_SHIP_IN_VECTOR 200
+#define MAX_SHIP_IN_VECTOR 5
 class ship {
 public:
     uint32_t _userID;
@@ -45,7 +45,6 @@ public:
     ship(uint32_t UserID, std::string ShipName) :  _userID(UserID), _shipName(ShipName) {}
 };
 
-extern std::vector<ship *> vships;
 
 // Types 1, 2 and 3: Position Report Class A or B
 bool SetAISClassABMessage1(tNMEA0183AISMsg &NMEA0183AISMsg, uint8_t MessageType, uint8_t Repeat,
@@ -78,6 +77,7 @@ bool  SetAISClassBMessage24(tNMEA0183AISMsg &NMEA0183AISMsg, uint8_t MessageID,
                           uint32_t UserID, uint8_t VesselType, char *VendorID, char *Callsign,
                            double Length, double Beam, double PosRefStbd,  double PosRefBow, uint32_t MothershipID );
 
+int numShips();
 inline int32_t aRoundToInt(double x) {
   return x >= 0
       ? (int32_t) floor(x + 0.5)
diff --git a/lib/queue/GwBuffer.cpp b/lib/queue/GwBuffer.cpp
index fc2e83e..d60a3ee 100644
--- a/lib/queue/GwBuffer.cpp
+++ b/lib/queue/GwBuffer.cpp
@@ -8,6 +8,7 @@ void GwBuffer::lp(const char *fkt, int p)
 
 GwBuffer::GwBuffer(GwLog *logger,size_t bufferSize)
 {
+    LOG_DEBUG(GwLog::DEBUG,"creating new buffer %p of size %d",this,(int)bufferSize);
     this->logger = logger;
     this->bufferSize=bufferSize;
     this->buffer=new uint8_t[bufferSize];
diff --git a/lib/serial/GwSerial.cpp b/lib/serial/GwSerial.cpp
index e6c5c1f..ca9444e 100644
--- a/lib/serial/GwSerial.cpp
+++ b/lib/serial/GwSerial.cpp
@@ -15,6 +15,7 @@ class SerialWriter : public GwBufferWriter{
 };
 GwSerial::GwSerial(GwLog *logger, uart_port_t num, int id,bool allowRead)
 {
+    LOG_DEBUG(GwLog::DEBUG,"creating GwSerial %p port %d",this,(int)num);
     this->id=id;
     this->logger = logger;
     this->num = num;
@@ -79,6 +80,7 @@ void GwSerial::sendToClients(const char *buf,int sourceId){
 }
 void GwSerial::loop(bool handleRead){
     write();
+    if (! isInitialized()) return;
     if (! handleRead) return;
     char buffer[10];
     int rt=uart_read_bytes(num,(uint8_t *)(&buffer),10,0);
@@ -87,6 +89,7 @@ void GwSerial::loop(bool handleRead){
     }
 }
 bool GwSerial::readMessages(GwBufferWriter *writer){
+    if (! isInitialized()) return false;
     if (! allowRead) return false;
     return readBuffer->fetchMessage(writer,'\n',true) == GwBuffer::OK;
 }
\ No newline at end of file
diff --git a/lib/socketserver/GwSocketServer.cpp b/lib/socketserver/GwSocketServer.cpp
index 024d041..9231ec3 100644
--- a/lib/socketserver/GwSocketServer.cpp
+++ b/lib/socketserver/GwSocketServer.cpp
@@ -68,6 +68,7 @@ class GwClient{
             overflows=0;
             if (client != NULL){
                 writer=new Writer(client);
+                LOG_DEBUG(GwLog::DEBUG,"creating SocketWriter %p",writer);
                 remoteIp=client->remoteIP().toString();
             }
         }
@@ -76,10 +77,14 @@ class GwClient{
             buffer->reset();
             if (readBuffer) readBuffer->reset();
             overflows=0;
-            if (writer) delete writer;
+            if (writer) {
+                LOG_DEBUG(GwLog::DEBUG,"deleting SocketWriter %p",writer);
+                delete writer;
+            }
             writer=NULL;
             if (client){
                 writer=new Writer(client);
+                LOG_DEBUG(GwLog::DEBUG,"creating SocketWriter %p",writer);
                 remoteIp=client->remoteIP().toString();
             }
             else{
@@ -162,12 +167,12 @@ GwSocketServer::GwSocketServer(const GwConfigHandler *config,GwLog *logger,int m
     this->minId=minId;
     maxClients=config->getInt(config->maxClients);
     allowReceive=config->getBool(config->readTCP);
+}
+void GwSocketServer::begin(){
     clients=new gwClientPtr[maxClients];
     for (int i=0;i<maxClients;i++){
         clients[i]=gwClientPtr(new GwClient(wiFiClientPtr(NULL),logger,allowReceive));
     }
-}
-void GwSocketServer::begin(){
     server=new WiFiServer(config->getInt(config->serverPort),maxClients);
     server->begin();
     logger->logString("Socket server created, port=%d",
@@ -177,6 +182,7 @@ void GwSocketServer::begin(){
 }
 void GwSocketServer::loop(bool handleRead)
 {
+    if (! clients) return;
     WiFiClient client = server->available(); // listen for incoming clients
 
     if (client)
@@ -234,7 +240,7 @@ void GwSocketServer::loop(bool handleRead)
 }
 
 bool GwSocketServer::readMessages(GwBufferWriter *writer){
-    if (! allowReceive) return false;
+    if (! allowReceive || ! clients) return false;
     bool hasMessages=false;
     for (int i = 0; i < maxClients; i++){
         writer->id=minId+i;
@@ -244,6 +250,7 @@ bool GwSocketServer::readMessages(GwBufferWriter *writer){
     return hasMessages;
 }
 void GwSocketServer::sendToClients(const char *buf,int source){
+    if (! clients) return;
     int len=strlen(buf);
     int sourceIndex=source-minId;
     for (int i = 0; i < maxClients; i++)
@@ -262,6 +269,7 @@ void GwSocketServer::sendToClients(const char *buf,int source){
 }
 
 int GwSocketServer::numClients(){
+    if (! clients) return 0;
     int num=0;
     for (int i = 0; i < maxClients; i++){
         if (clients[i]->hasClient()) num++;
diff --git a/lib/socketserver/GwSocketServer.h b/lib/socketserver/GwSocketServer.h
index 38bc001..61166c1 100644
--- a/lib/socketserver/GwSocketServer.h
+++ b/lib/socketserver/GwSocketServer.h
@@ -13,7 +13,7 @@ class GwSocketServer{
     private:
         const GwConfigHandler *config;
         GwLog *logger;
-        gwClientPtr *clients;
+        gwClientPtr *clients=NULL;
         WiFiServer *server=NULL;
         bool allowReceive;
         int maxClients;
diff --git a/platformio.ini b/platformio.ini
index e1f3321..9a53355 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -20,7 +20,7 @@ lib_deps =
 board_build.embed_files = 
 	generated/index.html.gz
 	generated/config.json.gz
-extra_scripts = extra_script.py
+extra_scripts = pre:extra_script.py
 build_flags=
 	-Igenerated
 
diff --git a/src/main.cpp b/src/main.cpp
index 5861af5..a209c6c 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -25,6 +25,7 @@
 #include <ArduinoJson.h>
 #include <ESPmDNS.h>
 #include <map>
+#include "esp_heap_caps.h"
 
 #include "N2kDataToNMEA0183.h"
 
@@ -65,7 +66,7 @@ Preferences preferences;             // Nonvolatile storage on ESP32 - To store
 bool SendNMEA0183Conversion = true; // Do we send NMEA2000 -> NMEA0183 conversion
 bool SendSeaSmart = false; // Do we send NMEA2000 messages in SeaSmart format
 
-N2kDataToNMEA0183 *nmea0183Converter=N2kDataToNMEA0183::create(&logger, &boatData,&NMEA2000, 0, N2K_CHANNEL_ID);
+N2kDataToNMEA0183 *nmea0183Converter=NULL;
 
 // Set the information for other bus devices, which messages we support
 const unsigned long TransmitMessages[] PROGMEM = {127489L, // Engine dynamic
@@ -193,7 +194,7 @@ GwConfigInterface *sendTCP=NULL;
 GwConfigInterface *sendSeasmart=NULL;
 GwConfigInterface *systemName=NULL;
 
-GwSerial usbSerial(&logger, UART_NUM_0, USB_CHANNEL_ID);
+GwSerial usbSerial(NULL, UART_NUM_0, USB_CHANNEL_ID);
 class GwSerialLog : public GwLogWriter{
   public:
     virtual ~GwSerialLog(){}
@@ -357,6 +358,7 @@ void setup() {
 
   MDNS.addService("_http","_tcp",80);
 
+  nmea0183Converter= N2kDataToNMEA0183::create(&logger, &boatData,&NMEA2000, 0, N2K_CHANNEL_ID);
   // Reserve enough buffer for sending all messages. This does not work on small memory devices like Uno or Mega
 
   NMEA2000.SetN2kCANMsgBufSize(8);
@@ -493,9 +495,21 @@ class NMEAMessageReceiver : public GwBufferWriter{
       writePointer=buffer;
     }
 };
+NMEAMessageReceiver receiver;
+unsigned long lastHeapReport=0;
+const unsigned long HEAP_REPORT_TIME=2000;
 void loop() {
   gwWifi.loop();
-
+  unsigned long now=millis();
+  if (now > (lastHeapReport+HEAP_REPORT_TIME)){
+    lastHeapReport=now;
+    if (logger.isActive(GwLog::DEBUG)){
+      logger.logDebug(GwLog::DEBUG,"Heap free=%ld, minFree=%ld",
+          (long)xPortGetFreeHeapSize(),
+          (long)xPortGetMinimumEverFreeHeapSize()
+      );
+    }
+  }
   handleSendAndRead(true);
   NMEA2000.ParseMessages();
 
@@ -512,11 +526,10 @@ void loop() {
   //handle messages from the async web server
   Message *msg=NULL;
   if (xQueueReceive(queue,&msg,0)){
-    logger.logDebug(GwLog::DEBUG+1,"main message");
+    logger.logDebug(GwLog::DEBUG,"main message");
     msg->process();
     msg->unref();
   }
-  NMEAMessageReceiver receiver;
   socketServer.readMessages(&receiver);
   //read channels