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GPSMAP 176/176C Owner’s Manual 79
APPENDIX > SATELLITE INFORMATION
Connecting the Power/Data
The power/data cable connects the GPSMAP 176/176C to a 8–35
volt DC system and provides interface capabilities for connecting
external devices. The color code in the diagram below indicates the
appropriate harness connections. Replacement fuse is a AGC/3AG
- 1.5 Amp fuse.
Interfacing
The following formats are supported for connection of external
devices:
Garmin proprietary Differential GPS (DGPS), NMEA 0183 versions
2.3, ASCII Text Output, RTCM SC-104 input (version 2.0).
The following are the sentences for NMEA 0183, version 2.3 output:
Approved sentences—GPRMC, GPGGA, GPGSA, GPGSV,
GPGLL, GPBOD, GPRTE, and GPWPL.
Proprietary sentences—PGRME, PGRMZ, and PSLIB. The
GPSMAP 176/176C accepts NMEA input with support for the DBT,
DPT, MTW, and VHW sentences.
You can download a copy of Garmin’s proprietary communication
protocol on the Help and Support section of our Web site at
www.garmin.com.
8-35
Brown: Data Out
White: Data In
Black: Ground
Red: Power
volts DC
Autopilot/
NMEA Device
GBR 21/23
Beacon
Receiver
Unit View
Data In
White
Power
Red
Ground
Black
Data Out
Brown
Cable View
Data In
White
Power
Red
Data Out
Brown
Ground
Black