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The issue is related to the antenna, either bad connection, low voltage or faulty gps. Start by checking the voltage supplied to the antenna (most probably through SeaTalk from the plotter), if you find this to be 11V or bellow - beef it up by adding external 12V. You can also check the wiring, if all looks ok - it is time to get a new gps antenna. Raymarine has a retrofit pack for the new RS130 which also includes SeaTalk ng converter.
With some luck it's only the power...
I'm taking this as you want to send the gps information to your C80 not receive from the C80? If this is the case the brown wire on the garmin is the nmea data out +. The Black wire is considered nmea out neg (-) of the garmin. So hook the garmin brown to the white on the raymarine. Hook the black from the garmin to the green on the raymarine. That means you are outputting lat/long info to the raymarine from the garmin.
Before you buy a new one if that is a raytheon raystar unit there is a lithium battery inside the unit check that first thats all you may have to replace.
The GPS antenna with the 300 is not a GPS receiver unit like all the later Raymarine units and is no longer made. However the unit will accept input from a GPS receiver with Seatalk output. So you could use a 112, 120 or 125 receiver.
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