Interface Setup; Dgps Setup - Garmin GPS 38 Owner's Manual

Interface Setup

The GPS 38's interface setup page lets you specify the
interfacing formats for connecting external devices. There
are five interface options: GRMN/GRMN, None/None,
None/NMEA, RTCM/None, and RTCM/NMEA. Each option
lists the input format first, followed by the output format.
To select I/O format:
1. Highlight the I/O field and press
2. Select the desired setting and press
The GRMN/GRMN setting is a proprietary format that
lets you exchange information such as waypoints, routes
and track logs between two GARMIN GPS devices or a PC.
During data transfer, the number of packets being
exchanged will be displayed on screen.
To select a transfer option:
1. Highlight the 'Host' field and press
2. Select a setting and press
To disable all interfacing capabilities, select the
None/None setting. If you want to output NMEA data to
compatible external devices without any differential input
capability, select the None/NMEA setting. Once a NMEA
output setting has been selected (with or without RTCM
input), the NMEA field will become highlighted. NMEA
formats 0180, 0182 or 0183 (1.5 or 2.0) are available.
To select a NMEA format:
E
1. Press to begin a NMEA selection.
2. Select a format and press
DGPS Interface
The last two format settings allow the differential-ready
GPS 38 to accept RTCM DGPS corrections in RTCM 104
version 2.0 format. Using DGPS corrections will improve
receiver accuracy to 5-10 meters, regardless of errors
induced by the government's Selective Availability (SA) pro-
gram. The RTCM/NONE format will allow connection to
any manually tuned beacon receiver with the proper output
interface, with the baud rate selectable from the GPS 38.
E
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E
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E
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E
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E
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R E F E R E N C E
Interface Setup
& DGPS Setup
Interface Setup Page
The default interface setting
is the GARMIN/GARMIN
option, which can be used
for unit-to-unit data trans-
fer or interfacing with a
GARMINPCKit.
NMEAInterface
Once a NMEA format is
selected, the baud rate will
automatically be set to the
proper speed. See Appendix
C for a list of NMEA
sentences.
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