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ContinuousWave: Small Boat Electrical
NMEA-0183 Interface: Garmin GPS to ICOM Radio
|Author||Topic: NMEA-0183 Interface: Garmin GPS to ICOM Radio|
posted 04-21-2007 05:57 PM ET (US)
I own the Garmin 178 GPS plotter and SONAR and the ICOM 402 [VHF] marine radio. I am trying to connect the GPS to the [VHF] for use with Digital Selective Calling and sending my coordinates to another radio. The Garmin manual shows that for "port 2" (VHF / DSC device) I should connect the green and white wires to the RCA male jack that will go into the RCA female jack on the Icom. The radio scrolls "no position" indicating that the radio does not recognize the Garmin. The female radio side of the connection indicates that the center pin receptacle on the jack is for NMEA in or (+). I believe I am following the instructions correctly. On the GPS, I checked to be sure that the DSC tab was "on" It is. I am stumped! Any ideas?
posted 04-21-2007 10:21 PM ET (US)
I just wired the same (almost) combination on my boat. I think your problem may be in the communication tab of the GPS. Personally I didn't even know that the DSC tab existed. I did however have to "turn on" the communication port on the GPS.
Below are the two pages relevant from each unit. Let me know if it gives you any trouble and I will find my installation notes.
You should know that after I setup the communication tab on the GPS, the radio listed the position right away.
ICOM - 402
posted 04-21-2007 11:08 PM ET (US)
Thank You, Thank You, THANK YOU! That was it! The NMEA switch within the Garmin 178 Comm tab was off. I powered up the radio and, voilá, my current position (on the trailer in the garage!)went scrolling by on the Icom screen. I was scratching my head for three ours this afternoon. You solved my dilemma!
posted 04-22-2007 01:15 AM ET (US)
Good information. Thanks for providing the help.
Getting two serial data communication devices to talk to each other can be very frustrating. Often there is no test equipment, and you have no way to know if it works or not until it finally starts working.
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