Connecting Garmin 178c to DSC VHF wiring help.

[nautihabits]

I have a 178C GPSMAP and West Marine VHF500 DSC VFH radio. GPS wiring shows a data in (white) and data out (green). VHF wiring shows a data in (green) and no data out. So do I just connect the green and the white is for something else into the GPS? Is the VHF supposed to communicate back to the GPS or just receive the GPS data? Then the VHF wiring has a DC13.8v and GND for GPS Ant. do i need to use these in this application.

 

[cuzner]

Re: Connecting Garmin 178c to DSC VHF wiring help.

You realy got me thinking on this one!!! I went through the manual to my Navman. As long as both your gps and dcs vhf are NMEA compatible the data out from your gps hooks into your vhf. The data in is only used for other functions, wich you may not have such as locating other boats on your gps screen, through the signal recieved on your vhf, unless your dcs vhf supports this I think the wire you need to worry about is the data out.<br /><br /> Jim

 

[Boatist]

Re: Connecting Garmin 178c to DSC VHF wiring help.

I think you need to connect the two green wires. You want the GPS data out (green) to go to the VHF data in wire (green).

 

[nautihabits]

Re: Connecting Garmin 178c to DSC VHF wiring help.

OK that's what I am going with Data out from GPS data in to VHF DSC radio (both green) is the only connection I have to make to allow for DISTRESS call to function. I'm installing this weekend we'll see how it goes Thank you.<br /><br />Glen

 

[tommays]

Re: Connecting Garmin 178c to DSC VHF wiring help.

On and I-COM VHF the green is - NEMA in and yellow is + NEMA in<br /><br />I dont see how it can recive data with a single wire ? you need at least 2 wires<br /><br />tommays

 

[nautihabits]

Re: Connecting Garmin 178c to DSC VHF wiring help.

The radio has a DC jack and accessory cord, the acc. cord only has the following:<br /><br />orange - ext. speaker +<br />black - ext. speaker - (gnd)<br />red - dc +13.8v<br />green - GPS data in<br />brown - PA+<br />bare - PA- (gnd)<br />blue - NC<br /><br />Garmin tech support sent me this:<br />The GPS will need to be set to NMEA In/NMEA Out.<br /><br />GPSMAP 178C - Radio<br /><br />Blue (Data Out) - NMEA Positive input<br />Black (Ground) - NMEA Negative input<br /><br />Not sure how that matches up with the radio wiring?

 

[Boatist]

Re: Connecting Garmin 178c to DSC VHF wiring help.

Tommays is right it does need two wires, but as long as both are run off the same battery then the second wire is the radios and Gps dc ground wire.