Garmin gpsmap 278 Manuale Utente

This section of the Appendix provides information on connecting the 

GPSMAP 278 to auxiliary devices and removing the antenna.

The power/data cable connects the GPSMAP 278 to an 11–35 VDC 

system and provides interface capabilities for connecting external 

devices. The color code in the diagram below and to the right 

indicates the appropriate harness connections. Replacement fuse is a 

3AG - 1.5 Amp fuse.

Data Out 1 

Blue

Ground 

Black

Voice (-) 

Orange

Alarm 

White

Power 

Red

Voice (+) 

Brown

Data In 1 

Yellow

Data In 2 

Green

Data Out 2 

Violet

Data Out 1 

Blue

Ground 

Black

Voice (-) 

Orange

Alarm 

White

Power 

Red

Voice (+) 

Brown

Data In 1 

Yellow

Data In 2 

Green

Data Out 2 

Violet

Yellow: 

Data In 1

Black:

Ground

Red: Power

11–35 VDC

(-)

(+)

Autopilot/ 

NMEA Device

RXD +

RXD -

GSD 20 or 21 

Sounder

(-)

(+)

White/Brown

White/Blue

Blue: 

Data Out 1

Orange

Closed - On, 

Open - Off

Switch

A

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