Log substitute using the GPS from Moitisier HAT 2

[PaddyB]

Niklun, this might be what you  are looking for, the derived data plugin calculates ground wind speed & direction based on sog & cog and sends it as environment.wind.angleTrueGround and environment.wind.speedOverGround. Then I have some node red which takes the values of thos and sends them as environment.wind.speedTrue and environment.wind.angleTrueWater.

Code:

[
   {
       "id": "566b4bb6.eac0a4",
       "type": "signalk-subscribe",
       "z": "750594de.8e494c",
       "name": "environment.wind.speedOverGround",
       "mode": "sendAll",
       "flatten": true,
       "context": "vessels.self",
       "path": "environment.wind.speedOverGround",
       "source": "",
       "period": 1000,
       "x": 240,
       "y": 1040,
       "wires": [
           [
               "f784a4c3.41c338"
           ]
       ]
   },
   {
       "id": "8334969e.d3b278",
       "type": "signalk-send-pathvalue",
       "z": "750594de.8e494c",
       "name": "",
       "source": "",
       "x": 990,
       "y": 1020,
       "wires": []
   },
   {
       "id": "f784a4c3.41c338",
       "type": "function",
       "z": "750594de.8e494c",
       "name": "environment.wind.speedTrue",
       "func": "msg.topic = \"environment.wind.speedTrue\";\nreturn msg;",
       "outputs": 1,
       "noerr": 0,
       "x": 620,
       "y": 1060,
       "wires": [
           [
               "8334969e.d3b278"
           ]
       ]
   },
   {
       "id": "76df8946.05b5e8",
       "type": "signalk-subscribe",
       "z": "750594de.8e494c",
       "name": "environment.wind.angleTrueGround",
       "mode": "sendAll",
       "flatten": true,
       "context": "vessels.self",
       "path": "environment.wind.angleTrueGround",
       "source": "",
       "period": 1000,
       "x": 240,
       "y": 1100,
       "wires": [
           [
               "c10abcac.64d97"
           ]
       ]
   },
   {
       "id": "c10abcac.64d97",
       "type": "function",
       "z": "750594de.8e494c",
       "name": "environment.wind.angleTrueWater",
       "func": "msg.topic = \"environment.wind.angleTrueWater\";\nreturn msg;",
       "outputs": 1,
       "noerr": 0,
       "x": 640,
       "y": 1100,
       "wires": [
           [
               "cd2581b1.513c6"
           ]
       ]
   },
   {
       "id": "cd2581b1.513c6",
       "type": "signalk-send-pathvalue",
       "z": "750594de.8e494c",
       "name": "",
       "source": "",
       "x": 990,
       "y": 1080,
       "wires": []
   }
]

Then set signalk to nmea plugin to create VWT sentence and opencpn recognizes that.