Hi Gezy
well..if I remember right ..there are 2 wires that connect too the radio and gps...mine was brwn/purple...on the gps ..going to the blue/green wires...but to be sure...you need to contact the vendors that built them and find out which ones they are....
wish I could help better but each vendor might use different colored wires...
nmea=national marine engineers assoc.
I think..
SP
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