choose UDP ports

[Didier B]

Isn't UDP is a networking protocol?

Just a guess, but your VHF is most likely NMEA0183 and the autopilot NMEA2000. They connect to SignalK through a serial bus or Can bus, so UDP isn't really something that would apply here, as it's for ethernet or wifi connections. The SignalK-to-NMEA2000 plugin handles the back and forth through to the NMEA2000 network. And the serial ports are set up in SignalK connections. The NMEA0183-to-NMEA0183 and SignalK-to-NMEA0183 plugins are also useful here.

You previously made your VHF received data from signalk for the GPS. The turn around for that is to receive data on the same port and route it in nmea0183-to-nmea0183 plug in just the same.

Hi SCarns, thank you for your answer. In my case both PiIlot and VHF use NMEA0183. So far I managed to avoid any contact with N2k !
I can undestand it is possible to send the position info in an NMEA form (RMC) to send it to the VHF using SignalK-to-NMEA0183 plugin.
But tell me, if you don't use UDP port, how do you pull info (APB,XTE) out from openCPN to route it to the pilot ?