Garmin GPSMAP 190-00683-00 User Manual

Page 129

Interfacing

The following formats are supported for connection of external

devices: GARMIN proprietary Differential GPS (DGPS), NMEA

0180, 0182, 0183 (versions 1.5, 2.0, 2.3, 3.01), ASCII Text Output,

and RTCM SC-104 input (version 2.0).
The following are the Approved Sentences for NMEA 0183,

version 3.01 output: GPRMC, GPGGA, GPGSA, GPGSV, GPGLL,

GPBOD, GPRTE, and GPWPL. The following are the Proprietary

Sentences for NMEA 0183, version 3.01 output: PGRME, PGRMZ,

and PGRMM.
The GPSMAP 378/478 also includes NMEA input with support for

the BWC, DBT, DPT, DSC, DSE, MTW, VHW, VTG, and XTE

sentences.
Garmin’s proprietary communication protocol is available from the

Web site (

You can remove the GPS antenna to use an external antenna. After

the antenna is removed, the BNC connector is exposed and ready

for use with an external antenna. For information on connecting an

external antenna to the GPSMAP 378/478, refer to the installation

instructions that came with the antenna.

To remove the GPS antenna:

1. Remove the external power cable from the connector on the

back of the GPSMAP 378/478.

2. Rotate the antenna to approximately a seven o’clock

position. The alignment notches in the casing must line up

with the notches on the antenna.

3. Pull the antenna away from the GPSMAP 378/478 unit.

Removing the GPS Antenna

GPSMAP 378/478 Owner’s Manual

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