Garmin gpsmap 192c User Manual

A

PPENDIX

 > 

C

ONNECTING

 

THE

 P

OWER

/D

ATA

The power/data cable connects the GPSMAP 192C to a 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. For wiring the GPSMAP to a GSD 20 Sonar Module, refer to 

the “GSD 20 Installation Guide.”

1

2

3

4

5

6

7

PIN 1 (red) Power

PIN 2 (black) Ground (Power and Data)

PIN 3 (blue) NMEA OUT (Com 1 TX)

PIN 4 (brown) NMEA IN (Com 1 RX)

PIN 5 (white) RTCM/NMEA IN (Com 2 RX)

PIN 6 (green) NMEA OUT (Com 2 TX)

PIN 7 (yellow) Alarm Low

NMEA

Device with

Sonar Output

TXD +

Alarm Relay

100ma max

coil current

GSD 20,

Beacon

Receiver or

DSC VHF

Autopilot/

NMEA Device

DC �

Power Source

RXD +

RXD -

RX+

TX+

Complete information regarding NMEA and RTCM formats is 

available for purchase at www.nmea.org

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 (vs. 2.0).
The following are the sentences for NMEA 0183, vs. 2.3 output:
Approved sentences—GPRMC, GPGGA, GPGSA, GPGSV, 

GPGLL, GPBOD, GPRTE, and GPWPL.
Proprietary sentences—PGRME, PGRMZ, and PSLIB. The 

GPSMAP 192C accepts NMEA input with support for the DBT, 

DPT, MTW, and VHW sentences.  
The GPSMAP 192C also includes NMEA input with support for 

the WPL sentence and sonar NMEA input with support for the DPT 

(Depth), MTW (Water Temp) and VHW (Water Speed & Heading) 

sentences. If connecting to COM 2 for sonar NMEA input, the unit 

interface must be set to NMEA In/NMEA Out. If connecting to 

COM 1, the unit must be set to NMEA In/NMEA Out.
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.