Power/Data Cable Wiring
The following pages contain several wiring diagrams. The first diagram on the next page is a simple diagram showing the GPSMAP 3000 series
chartplotter using the 18-pin Power/data cable and the GPS 17x. If two or more GPSMAP 3000, 4000, or 5000 series chartplotters are installed
and networked, only one GPS 17x antenna needs to be installed. Next are wiring diagram examples showing the GPSMAP 3000 using the
18-pin Power/Data wiring harness interfacing with a variety of different equipment. Refer to the wiring diagram that best suits your needs. For
third-party devices, refer to the wiring guidelines included with that equipment. Use 22 AWG (18 AWG for the Red and Black wires), shielded,
twisted-pair wiring for extended runs of wire. Solder all connections and seal the connection with heat shrink tubing. If networking two or
more chartplotters, the GPS 17x and NMEA input devices should only be attached to one chartplotter on the network. A pinout of the
cable is shown below.
Power/Data Cable Input/Output Ports
The GPSMAP 3000 series Power/data cable has four I/O (Input/Output) ports.
Ports 1 and 2—communicate with other NMEA-compliant devices, such as VHF radios, NMEA instruments, autopilots, or PCs (Port 1 only).
You can input one NMEA device to each port, and output in parallel to three NMEA devices per port.
Port 3—is reserved for use with Garmin sounder modules.
Port 4—is reserved for use with the Garmin GPS 17x GPS antenna.
The following formats are supported for connection of external devices: Garmin proprietary sonar module and NMEA 0183 version 3.01. The
following are the sentences for NMEA 0183, version 3.01 and later output:
Approved sentences—GPBWC, GPRMC, GPGGA, GPGSA, GPGSV, GPGLL, GPBOD, GPRMB, GPRTE, GPVTG, GPWPL, and GPXTE
Garmin proprietary sentences—PGRME, PGRMM, PGRMZ, and PSLIB
The unit also includes NMEA input with support for the WPL sentence, DSC, and sonar NMEA input with support for the DPT (Depth) or
DBT, MTW (Water Temp), and VHW (Water, Speed, and Heading) sentences. The unit interface must be set to NMEA In/NMEA out.
Documentation concerning NMEA and RTCM formats and sentences are available for purchase from:
National Marine Electronics Association (NMEA)
Seven Riggs Avenue
Severna Park, MD 21146
U.S.A.
www.nmea.org
Function
DC power input
Ground (Power/data)
Port 1: Data in (Rx)
Port 1: Data out (Tx)
Port 2: Data in (Rx)
Port 2: Data out (Tx)
Port 3: Data in (Rx)
Port 3: Data out (Tx)
Accessory on signal
Port 4: Data in (GPS 17x) White
Port 4: Data out (GPS 17x) Green
Alarm low signal
No function
Color
Pin #
Red
15
Black
18
Brown
16
Blue
17
Violet
9
Gray
10
White/Brown
4
White/Blue
5
Orange
6
13
14
Yellow
11
No color
1,2,3,7,8,12
Power/Data(NMEA) Cable
1
2
4
3
6
5
7
11
10
9
8
12
15
14
13
18
17
16
Cable End View
GPSMAP 3000 Series Installation Instructions
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