Originally Posted by leonhouse
hi can any one help with connecting a garmin 172/172c to a silva s15 dsc radio to give gps position the radio has only two wires to use gps+ and gps - but the garmin has a host of colours eg red and black power.
blue nmea out (com 1 tx)
brown nmea in (com 1 rx)
white rtcm/nmea in (com 2 rx)
green nmea out (com 2 tx)
yellow alarm low
I think you want to connect GARMIN BLUE to SILVA GPS+ and also join the GARMIN BLACK (battery ground) to SILVA GPS-.
(this will connect the radio to "COM 1" on your gps. You need to set up the garmin to transmit in NMEA mode on this port (somewhere in the settings). Most DSC radios seem to have the correct "listening" information so probably doesn't need any settings changed.).