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GETTING STARTED > INSTALLATION
8 Fishfinder 250/250C Owner’s Manual
The Fishfinder 250/250C can be connected to another piece of
NMEA compatible electronic equipment, such as a Garmin GPS
(Global Positioning System). If equipped with a capable transducer,
the Fishfinder 250/250C can send depth, temperature, and speed
information to the NMEA device. It can also mark a location (page
20) that could be displayed on another device and can accept
GPS navigational data (page 23), such as position, time, course,
distance, etc. Refer to the wiring diagram on the following page for
interfacing the Fishfinder 250/250C with other devices.
To connect the power/data cable to a GPS or other
NMEA device:
1. Follow steps 1-4 of the voltage source installation (page
7). 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 250/250C NMEA Input/Output to On
(page 27). For Garmin GPS units, set the communications
interface to NMEA/NMEA, NMEA In/NMEA Out, or NMEA.
Interfacing
The Fishfinder 250/250C allows for NMEA 0183, Version 2.3
input/output with a compatible GPS or navigation device. NMEA
Input/Output must be set to On to send/receive data (page 27).
For additional information on using your Fishfinder 250/250C with
NMEA devices, see pages 20 and 27.
The following sentences are for NMEA 0183, Version 2.3:
Input—GPBOD, GPBWC (only used if RMB not present),
GPGGA, GPGLL (only used if GGA not present), GPRMB,
GPRMC, GPXTE (only used if RMB not present)
Output—SDDBT, SDDPT, SDMTW, SDVHW, SDWPL* (only if a
waypoint is “marked” in Pointer mode)
*Garmin GPS units will accept an SDWPL (WPL) NMEA sentence and create a
waypoint (saved location) at that position (page 20). For compatibility with other
brands of GPS or NMEA capable navigation devices, check with those manufacturers
to see if their units accept/store NMEA 0183 SDWPL sentences/waypoints. The
Fishfinder 250/250C does not store the actual waypoint. Only the receiving device, if
capable, will store the waypoint.