GPS/DSC radio connection

[EUXINE_Rival]

I have a Garmin GPS72 and an MT 500 radio. At the moment I cannot get them to talk. The data cable from the GPS connects to my laptop which is running Sea-Pro lite software with no problems. The wires in the data section of the cable are coloured black, white and yellow (the manual says that they are black white and brown) does any one know which I should connect to the brown and red wires from the radio?

 

[stevebrassett]

The 72 default communications is not NMEA, so you need to change that. Do you have a manual for the radio? The data out (brown) should connect to the +ve data receive terminal of the radio, and the black should connect both to the -ve battery terminal, and the -ve data receive terminal of the radio. Do you not have a 4th (power - red) wire from the GPS? My memory of wiring this is a bit hazy, so don't trust it until someone else confirms.

 

[EUXINE_Rival]

Thanks. I have already set the gps to NMEA so that should be ok. The cable I have connects both to a cigarette lighter socket to power the GPS, I assume that has red and black wires running through it, and it splits to also give a data lead which ends in a 9 pin serial plug for the computer. Inside the data section of cable are black white and yellow wires. The GPS at the moment is running on its own batteries.

 

[earlybird]

Garmin white is data in, so you can ignore that one. So I think that your Garmin yellow must be data out, (normally brown) so goes to radio brown, which is data +ve, and garmin black goes to radio red, which is data -ve. or, if that doesn't work, to radio ground, (shield)