diff --git a/lib/channel/GwChannel.cpp b/lib/channel/GwChannel.cpp
index 1b703cd..d25841d 100644
--- a/lib/channel/GwChannel.cpp
+++ b/lib/channel/GwChannel.cpp
@@ -128,9 +128,11 @@ void GwChannel::updateCounter(const char *msg, bool out)
     }
 }
 
-bool GwChannel::canSendOut(const char *buffer){
+bool GwChannel::canSendOut(const char *buffer, bool isSeasmart){
     if (! enabled || ! impl) return false;
-    if (! NMEAout || readActisense) return false;
+    if (readActisense) return false;
+    if (! isSeasmart && ! NMEAout) return false;
+    if (isSeasmart && ! seaSmartOut) return false;
     if (writeFilter && ! writeFilter->canPass(buffer)) return false;
     return true;
 }
@@ -177,9 +179,9 @@ void GwChannel::readMessages(GwChannel::NMEA0183Handler handler){
     receiver->setHandler(handler);
     impl->readMessages(receiver);
 }
-void GwChannel::sendToClients(const char *buffer, int sourceId){
+void GwChannel::sendToClients(const char *buffer, int sourceId, bool isSeasmart){
     if (! impl) return;
-    if (canSendOut(buffer)){
+    if (canSendOut(buffer,isSeasmart)){
         if(impl->sendToClients(buffer,sourceId)){
             updateCounter(buffer,true);
         }
diff --git a/lib/channel/GwChannel.h b/lib/channel/GwChannel.h
index c187ba6..77af597 100644
--- a/lib/channel/GwChannel.h
+++ b/lib/channel/GwChannel.h
@@ -56,7 +56,7 @@ class GwChannel{
     }
     bool isEnabled(){return enabled;}
     bool shouldRead(){return enabled && NMEAin;}
-    bool canSendOut(const char *buffer);
+    bool canSendOut(const char *buffer, bool isSeasmart);
     bool canReceive(const char *buffer);
     bool sendSeaSmart(){ return seaSmartOut;}
     bool sendToN2K(){return toN2k;}
@@ -67,7 +67,7 @@ class GwChannel{
     void loop(bool handleRead, bool handleWrite);
     typedef std::function<void(const char *buffer, int sourceid)> NMEA0183Handler;
     void readMessages(NMEA0183Handler handler);
-    void sendToClients(const char *buffer, int sourceId);
+    void sendToClients(const char *buffer, int sourceId, bool isSeasmart=false);
     typedef std::function<void(const tN2kMsg &msg, int sourceId)> N2kHandler ;
     void parseActisense(N2kHandler handler);
     void sendActisense(const tN2kMsg &msg, int sourceId);
diff --git a/src/main.cpp b/src/main.cpp
index 96cbb48..0bbe859 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -177,18 +177,24 @@ void handleN2kMessage(const tN2kMsg &n2kMsg,int sourceId, bool isConverted=false
   if (sourceId == N2K_CHANNEL_ID){
     countNMEA2KIn.add(n2kMsg.PGN);
   }
-  char *buf=new char[MAX_NMEA2000_MESSAGE_SEASMART_SIZE];
+  char *buf=new char[MAX_NMEA2000_MESSAGE_SEASMART_SIZE+3];
   std::unique_ptr<char> bufDel(buf);
   bool messageCreated=false;
   channels.allChannels([&](GwChannel *c){
     if (c->sendSeaSmart()){
       if (! messageCreated){
-        if (N2kToSeasmart(n2kMsg, millis(), buf, MAX_NMEA2000_MESSAGE_SEASMART_SIZE) != 0) {
+        size_t len;
+        if ((len=N2kToSeasmart(n2kMsg, millis(), buf, MAX_NMEA2000_MESSAGE_SEASMART_SIZE)) != 0) {
+          buf[len]=0x0d;
+          len++;
+          buf[len]=0x0a;
+          len++;
+          buf[len]=0;
           messageCreated=true;
         }
       }
       if (messageCreated){
-        c->sendToClients(buf,sourceId);
+        c->sendToClients(buf,sourceId,true);
       }
     }
   });
@@ -221,7 +227,7 @@ void SendNMEA0183Message(const tNMEA0183Msg &NMEA0183Msg, int sourceId,bool conv
   buf[len+1]=0x0a;
   buf[len+2]=0;
   channels.allChannels([&](GwChannel *c){
-    c->sendToClients(buf,sourceId);
+    c->sendToClients(buf,sourceId,false);
   });
 }
 
@@ -785,12 +791,16 @@ void loop() {
   //read channels
   channels.allChannels([](GwChannel *c){
     c->readMessages([&](const char * buffer, int sourceId){
+      bool isSeasmart=false;
+      if (strlen(buffer) > 6 && strncmp(buffer,"$PCDIN",6) == 0){
+        isSeasmart=true;
+      }
       channels.allChannels([&](GwChannel *oc){
-        oc->sendToClients(buffer,sourceId);
+        oc->sendToClients(buffer,sourceId,isSeasmart);
         oc->loop(false,true);
       });
       if (c->sendToN2K()){
-        if (strlen(buffer) > 6 && strncmp(buffer,"$PCDIN",6) == 0){
+        if (isSeasmart){
           tN2kMsg n2kMsg;
           uint32_t timestamp;
           if (SeasmartToN2k(buffer,timestamp,n2kMsg)){