Feature request: PGN 127258 - Magnetic Variation.

[alnavasa]

Hi, I would need to output this specific PGN so my AIS transmitter gets magnetic variation. It already gets magnetic heading from the NMEA2000 existing compass, but to transmit true heading it needs the magnetic variation, to do the math and then transmit it.

When I have other GPS (MFD) on on the NMEA2000 network it transmits perfectly, but I need the value on the NMEA 2000 network for when the other GPS (MFD) is off, so it can keep transmitting heading.

[alnavasa]

something like this?
I have pretty much zero coding knowledge, just edited form other code, dont know if its right or wrong, and how to implement it.

module.exports = (app, plugin) => {
  return {
    pgns: [ 127258 ],
    title: 'Angle (127258)',
    optionKey: 'ANGLE',
    keys: ["navigation.magneticVariation"],

    callback: (angle) => {
      try {
        return [
          {
            pgn: 127258,
            "Magnetic Variation": angle,
          }
        ]
      } catch ( err ) {
        console.error(err)
      }
    }
  }
}

[alnavasa]

@tkurki