Garmin GPSMAP 421s 010-00764-01 インストール手順

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.

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.

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.