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Yes, the NMEA- output (I think you lefy uot the "-" in your questoin), anyway, the NMEA - or NMEA negative or NMEA ref is hooked to battery supply ground.
Dont forget to program the Garmin to look for 48,000 baud data.
Fuses and Breakers Attach the red or positive wire to a 5 amp circuit breaker. If the unit is connected directly to the boat’s battery, include a 2 amp in-line fuse. (In-line fuses are available at most marine supply stores.) The power cable includes a smaller "shield" wire. Connect this to a good ground.
Extending the Power Cable If you need to extend the power wiring by more than 10 feet, use a larger wire size. This will allow the wires to deliver the correct voltage in spite of the longer wire distance. For runs of 20 to 35 feet, use #14 AWG cable. If you extend the power wiring, be sure all electrical connections are solid and durable. Soldering is the best way to make these connections. Insulate all connections using heat-shrink tubing or electrical tape. You may also use crimp connectors or a terminal strip, but be sure to use good-quality marine-grade parts.
I've done it, using an adjustable power supply all i needed was 12VDC -
2Amp, the power connector going to the scanner is a 4 pin mini-DIN
male, so i've ripped of the cable from the original bad power module,
cable has inside 2 wires one black one white and a shielding. Black and
schielding are connected together and are going to the minus, the white
one is going to +12V
I don't know the answer to this because I am looking for the same thing.This is the answer I got from Si-Tex:
You are going to need a cable, cble-6pf-sit. This cable will plug into your GPS-90, on the other end is bare wires. You are going to wire this into the pc somehow.
(somehow?)That's the part i'm interested in the most!
I ordered the cable can find nothing that shows how to wire it. I assume that it's wired to a db9 serial connector but have no idea what the pinout connections are. If you find out please let me know.