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connected to a power supply, electrolysis can occur in the power ca-
ble plug. This may result in corrosion of the plug body along with
the electrical contacts in the cable and the unit's power socket.
In saltwater environments we recommend you connect the unit
power cable to the auxiliary power switch included in most boat de-
signs. If that results in electrical interference, or if such a switch is
not available, we recommend connecting direct to the battery and
installing an inline switch. This will let you shut off power to the
power cable when the unit is not in use. When you are not using the
unit, you should always shut off power to the power cable, espe-
cially when the power cable is disconnected from the unit.
If possible, keep the power cable away from other boat wiring, especially
the engine's wires. This will provide the best isolation from electrical
noise. If the cable is not long enough, splice #18 gauge wire onto it.
The power cable has two wires, red and black. Red is the positive lead,
black is negative or ground. (There is also a white wire to power an op-
tional external speaker for some units.) Make sure to attach the in-line
fuse holder to the red lead as close to the power source as possible.
For example, if you have to extend the power cable to the battery or
power buss, attach one end of the fuse holder directly to the battery or
power buss. This will protect both the unit and the power cable in the
event of a short. It uses a 3-amp fuse.
Power connections for GlobalMap 3600C iGPS unit.
NOTE:
If you are powering a NMEA 2000 buss, you will attach both the
NMEA 2000 Power cable and the unit's Power Supply cable to an
electric power source.
12 volt
battery
Black wire
Red wire with
3 amp fuse
To unit
Data Cable
Optional power-off
switch for salt-
water installations
NMEA 2000 Power Cable
External speaker wire
(not used by this unit)
Mandatory
network
power-off
switch
To power a
NMEA 2000
buss, also
connect NMEA
2000 Power
cable to a
switched
power source.