Originally Posted by catch 22
Can anyone tell me for certain which wire on the GPS to connect the 2 from the radio for full DSC data connection – both ways????
With only two wires you can't have a two way connection. So, if your info above is complete, the following should be correct.
If your Navman cable colours are correct then; Garmin blue to Navman yellow, Garmin black to Navman green.
You could use Garmin port 2 if you prefer then; Garmin green to Navman yellow, Garmin black to Navman green.
If Codders is correct for your case then the Navman cables will need to be reversed.