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Apparently this will work:
1. Boat's DC negative to shiney black wire.
2. VHF's NMEA- to boat's DC negative.
3. Leave shield wire unconnected.
4. GPS white wire to VHF NMEA+.
I've got power to the chartplotter now, but can't test the GPS to VHF NMEA link until after the boat is outside and the chartplotter can see the sky.
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