Connecting the Wiring Harness to a NMEA 0183 Device
You can connect the GPSMAP device to other NMEA compatible equipment, such as a DSC or AIS device. Refer to the wiring diagram for
connecting the chartplotter to NMEA 0183-compatible devices.
GPSMAP
400/500
Series
Chartplotter
Wiring a GPSMAP 400/500 Series Chartplotter to a Standard NMEA 0183 Device
To connect the wiring harness to a NMEA 0183 device:
1. For Garmin devices, the ground (black) wires serve as NMEA 0183 ground and must be attached together or on the same terminal as the
NMEA 0183 ground on your NMEA 0183 device. Refer to the wiring diagram of your NMEA 0183 device for wire identification.
2. Connect the blue (NMEA 0183 port 1 out) wire from the GPSMAP 400/500 wiring harness to the NMEA 0183 in (or Rx/A +) wire on the
wiring harness of the NMEA 0183 device, and the brown (NMEA 0183 port 1 in) wire to the NMEA out (or Tx/A +) wire on the wiring harness
of the NMEA 0183 device.
3. Repeat step 2 using the grey and violet wires for an additional NMEA 0183 device.
4. Set the serial port(s) on the chartplotter to use NMEA 0183 data (standard or high speed). See the GPSMAP 400/500 Series Owner's
Manual for more information.
Connecting the Wiring Harness to an Optional Horn, Lamp, or Both
The GPSMAP 400/500 series chartplotter can be used with a lamp, a horn, or both, to sound or flash an alert when the chartplotter displays a
message. The alarm does not need to be wired for the GPSMAP 400/500 chartplotter to function. The alarm circuit switches to a low-voltage
state when the alarm sounds. The maximum current is 100 mA, and a relay is needed to limit the current from the chartplotter to 100 mA. To
select between visual and audible alerts, install a switch.
GPSMAP
400/500
series
chartplotter
* Certain GPSMAP 400/500 series chartplotters can be connected to higher-voltage power sources. Refer to the
* Certain GPSMAP 400/500 series chartplotters can be connected to higher-voltage power sources. Refer to the
Power section of the System Specifications on
Power section of the System Specifications on
GPSMAP 400/500 Series Installation Instructions
Wire color
Fuse
A
Red (power)
Black (ground)
Blue (out)
>
Brown (in)
>
Fuse
Wiring a GPSMAP 400/500 Series Chartplotter to a Horn, a Lamp, or Both
page 10
page 10
for more information.
for more information.
-
+
Battery
10– Vdc*
+
Battery
10– Vdc*
Wire color
A
Red
Black (ground)
Relay
100 ma max
Yellow (alarm)
coil current
Wire function
Power
Power ground
NMEA Ground
NMEA Rx/A (+)
>
NMEA Tx/A (+)
>
-
Horn
Lamp
NMEA 018
compliant device
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