Garmin GPSMAP 168 Sounder Owner's Manual And Reference Manual page 101

Appendix G
Wiring and
Interfacing
10-18 Volt Boat Supply
If your boat has an electrical
system, it may be possible
to wire the unit directly to
+
an unused holder on your
Install
current fuse block. If you are
2-Amp
using the boat's fuse block, Fuse
remove the in-line fuse holder
supplied with the unit.
-
If your boat does not have
a fuse block, the unit can be
Boat
wired directly to the battery.
Ground
Make sure the 2-Amp in-line
fuse supplied with the unit is
Black Wire
installed.
F
Complete information concerning NMEA
formats and sentences is available for
purchase from NMEA at:
NMEA
PO Box 3435
New Bern, NC 28564-3435
252-638-2626
92
252-638-4885 FAX.
Connecting the Power/Data
The power/data cable connects the GPSMAP 168 Sounder to a 10-18 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 - 2 Amp fuse.
Note: During a typical installation, only the Red and
Black wires are used. The other wires do not have to
be connected for normal operation of the unit.
Red Wire
Interfacing
The following formats are supported for connection of external devices: GARMIN proprietary
Differential GPS (DGPS), NMEA 0183 (version 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, GPWPL, SDDBT, SDDPT, SDMTW
and SDVHW; Proprietary sentences— PGRME, PGRMZ, and PSLIB. The GPSMAP 168 Sounder also
includes NMEA input with support for the WPL sentence.
You can download a copy of GARMIN's proprietary communication protocol from the Help and
Support section of our website at www.garmin.com.