Installing the Fishfinder 340C > Installing the Wiring Harness

The Fishfinder 340C can be connected to another piece of NMEA compatible electronic equipment, such as a Garmin GPS (Global Positioning System) device. If equipped with a capable transducer, the Fishfinder 340C can send depth, temperature, and speed information. It can also mark a location that can be viewed and possibly saved on another device (see page 41). The Fishfinder 340C can also accept GPS navigational data, such as position, time, course, or distance. Refer to the wiring diagrams for interfacing the Fishfinder 340C with other devices (see pages 17 and 19).

To install the wiring harness to a GPS or other NMEA device:

1.Follow the voltage source installation steps (see page 15).

For Garmin units, the ground (Black) wires serve as data ground and must be attached together or on the same terminal. Refer to the wiring diagram of your GPS unit for wire identification.

2.Connect the Blue (Data OUT) wire from the Fishfinder to the

Data IN wire on the GPS/NMEA harness.

3.Connect the Brown (Data IN) wire from the Fishfinder to the

Data OUT wire on the GPS/NMEA harness.

4.Set the Fishfinder 340C NMEA Input/Output to On

(page 32). For Garmin GPS units, set the communications interface to NMEA/NMEA, NMEA In/NMEA Out, or NMEA.

Interfacing with NMEA

The Fishfinder 340C allows for NMEA 0183, Version 3.01 input/output with a compatible GPS or navigation device. You must set NMEA Input/Output to On to send or receive data (page 32).

The following sentences are for NMEA 0183, Version 3.01:

Input—GPBOD, GPBWC (only used if RMB is not present), GPGGA, GPGLL (only used if GGA not present), GPRMB, GPRMC, GPXTE (only used if RMB is not present).

Output—SDDBT, SDDPT, SDMTW, SDVHW, SDWPL* (only if a waypoint is marked in Pointer mode).

*Garmin GPS units accept an SDWPL (WPL) NMEA sentence and create a waypoint (saved location) at that position (page 40). For compatibility with other brands of GPS or NMEA capable navigation devices, check with those manufacturers to see if their units accept and store NMEA 0183 SDWPL sentences and waypoints. The Fishfinder 340C does not store the actual waypoint. Only the receiving device, if capable, stores the waypoint.

You can purchase complete information about National Marine Electronics Association (NMEA) format and sentences from NMEA at:

NMEA

Seven Riggs Avenue

Severna Park, MD 21146 USA www.nmea.org

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Fishfinder 340C Owner’s Manual