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The GRMN/GRMN setting is a proprietary for-
mat that lets you exchange information such as
waypoints, routes and track logs between two GPS
40s or a PC with an optional GARMIN PC kit.
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
E
.
2. Use the
U
and
D
keys to select the desired
setting and press
E
.
To disable all GPS 40 interfacing capabilities,
select the None/None setting. If you want to out-
put 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. To choose an NMEA
format (0180, 0182 or 0183 version 1.5 or 2.0):
1. Press
E
to begin a NMEA selection.
2. Use the
U
and
D
keys to select the desired
setting and press
E
.
3. The baud rate will be selected automatically.
The last two format settings allow the GPS 40
to accept RTCM DGPS corrections in RTCM 104
version 2.0 format. 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 40.
The RTCM/NMEA selection controls the
GARMIN GBR-21 beacon receiver. Once a RTCM
setting has been selected, the GPS 40 will automat-
ically try to tune the last frequency and bit rate
you selected or will switch to the default frequency
of 304.0 kHz with a bit rate of 100 bps if no previ-
ous beacon has been tuned. You may also enter
your own frequency and bit rate if desired.
44
Reference
I/O and DGPS
Setup
40 rev B 8/6/98 1:48 PM Page 44