Appendix c wiring diagram – Garmin Geko 301 User Manual
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Appendix C
Wiring Diagram
Interface formats are selected from the SETUP Page. The input/output lines on your
Geko 301 are RS-232 compatible, allowing an interface to a wide range of external devices,
including PC’s, differential beacon receivers, marine autopilots and/or a second GPS receiver.
The NMEA 0183 version 3.0 interface format is supported by the Geko 301 and enables
the unit to drive up to three NMEA devices.
NMEA 0183 Version 3.0 Approved Sentences:
GPGGA, GPGLL, GPGSA, GPGSV, GPRMB, GPRMC, GPRTE, GPVTG, GPWPL, GPBOD
Garmin Proprietary Sentences:
PGRME (estimated error), PGRMM (map datum), PGRMZ (altitude), PSLIB (beacon
receiver control)
DGPS (Differential GPS) corrections are accepted in RTCM SC-104 version 2.0 format
through the ‘Data In’ line. Other beacon receivers with the correct RTCM format may be
used, but may not correctly display status or allow tuning control from the GPS unit.
The Geko 301 may be hard-wired to a serial connector using the Data Cable. Refer to
the wiring diagram and the Geko unit data connection (illustrated below).
The optional PC Interface Cable allows you to connect your Geko 301 to a computer’s
serial port.
Geko 301
Connector
Data
Cable
Ground (-)
Data Out
Data In
Power (+)
Ground
Data Out
Data In
White
Green
Black
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