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How to Wire a DSC to a GPS
- 1). An MMSI number issued by the FCC is required for international cruising. For cruising within US waters only, an MMSI number issued by BoatUS can be used. Request an MMSI number from the appropriate issuing authority if you do not already have one.
- 2). Refer to the VHF owner's manual to identify the NMEA signal wires on the VHF radio. There should be four wires: "IN+"," IN-", "OUT+", and "OUT-".
- 3). Refer to the GPS owner's manual to identify the corresponding NMEA signal wires on the GPS.
- 4). Use the crimping tool to attach crimp connectors to each of the four NMEA wires on the VHF radio.
- 5). Slide pieces of heat-shrink tubing onto each of the four NMEA wires on the GPS. Each piece of tubing should be long enough to cover the crimp connector plus about 1/2-inch on each side.
- 6). Crimp each of the four NMEA wires from the GPS to the corresponding crimp connector on the VHF NMEA wires. For example, the "IN+" wire on the GPS should be crimped to the "IN+" wire on the VHF.
- 7). Slide the heat shrink tubing on one wire down to completely cover the crimp connector and 1/2-inch of wire on each side. Use the heat gun at the lowest heat setting that will work to shrink the tubing and seal the connection. Repeat for the other three wires.