Garmin GPS 40 Owner's Manual & Reference page 55

Interface Setup
The 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
U
2. Use the and
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
U D
2. Use and
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.
U D
2. Use and
DGPS Interface
The last two format settings allow the differential-ready
GPS 40 to accept RTCM DGPS corrections in RTCM 104
version 2.0 format. DGPS corrections will improve receiver
accuracy to 5-10 meters, regardless of errors induced by the
government's Selective Availability (SA) program. The
RTCM/NONE format allows connection to any manually
tuned beacon receiver with the proper output interface,
with the baud rate selectable from the GPS 40.
E
.
D
keys to toggle through and select
E
.
E
to select a setting and press
to select a format and press
.
E
.
E
.
Reference
Interface 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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