Garmin eTrex Manuale Utente

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Interface formats are selected from the SETUP Page. 

The input/output lines on your eTrex are RS-232 compat-
ible, allowing easy 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 2.0 interface format is 

supported by the eTrex and enables the unit to drive up 
to three NMEA devices.

 GPGGA, GPGLL, GPGSA, GPGSV, GPRMB, GPRMC, 
GPRTE,  GPWPL, GPBOD

 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. The GARMIN GBR 21 is the recommended beacon 
receiver for use with the eTrex. 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 eTrex may be hard-wired to a serial connector 

using the Data Cable (see page 8 for ordering informa-
tion). Refer to the wiring diagram and the eTrex unit data 
connection illustrated below.

The optional PC Interface Cable (010-10206-00) 

allows you to connect your eTrex to a PC-compatible 
computer’s serial port.

eTrex 
Connector

Data
Cable

Ground (-)

Data Out

Data In

Power (+)

Ground

Data Out

Data In

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