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Most GPS devices have an output connector, which allows you to connect other devices which can make use of the positioning information. This usually takes place via standard NMEA connections.
The Garmin GPSMAP 185C Sounder supports up to 3 NMEA devices. The following is from Appendix A of the Garmin manual,
The following formats are supported for connection to up to 3 NMEA devices:
. NMEA 0180/NMEA0182
. NMEA 0183 version 1.5
. NMEA 0183 version 2.0"
So, you hook the output of the 185C to your Raymarine, and you should be good to go.
By the way, apropos of your other recent post, you'll want to be sure that the AWG18/2 wire connecting the Garmin to the radar is approved by Garmin, Raymarine, the NMEA, the ABYC, the EU, and other appropriate regulatory bodies :-) In my experience, this should not take longer than about six months. No doubt Dog will also want a piece of the action!
Last edited by btrayfors; 01-28-2009 at 11:53 AM.