Garmin 378 Manuale Proprietario

This section of the Appendix provides information on connecting the 

GPSMAP 378/478 to auxiliary devices and removing the antenna.

The power/data cable connects the GPSMAP 378/478 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 

Blue

Ground 

Black

Voice (-) 

Orange

Alarm 

White

Power 

Red

Voice (+) 

Brown

Data In 

Yellow

Data Out 

Blue

Ground 

Black

Voice (-) 

Orange

Alarm 

White

Power 

Red

Voice (+) 

Brown

Data In 

Yellow

Yellow: 

Data In

Black:

Ground

Red: Power

11–35 VDC

(-)

(+)

Autopilot/ 

NMEA Device

RXD +

RXD -

GSD 20 or 21 

Sounder

(-)

(+)

White/Brown

White/Blue

Blue: 

Data Out

Orange

Closed - On, 

Open - Off

Switch

A

PPENDIX

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NSTALLATION

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NFORMATION