-
Check that you use right sending period. Some periods has been listed on NMEA2000.cpp. I have not yet published file with new comments. Here are some you need:
case 129025L: // Lat/lon rapid, pri=2, period=100
case 129026L: // COG SOG rapid, pri=2, period=250 -
Try to send also GNSS message in every 1000 ms.
-
There may be some other GPS related message, what Garmin expects. E.g. Raymarine autopilot did not work without varaiation PGN 127258