To select a transfer option:
1. Highlight the ‘host’ field and press
E
.
2. Use
U
and
D
to select the desired setting and press
E
.
To disable all GPS 90 interfacing capabilities, select
the None/None setting. If you want to output NMEA
data to compatible external devices without any differen-
tial 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 f o rmats 0180, 01 82 or 0183
(version 1.5 or 2.0) are available.
To select an NMEA format:
1. Press
E
to begin a NMEA selection.
2. Use the
U
and
D
keys to select the desired setting.
3. Press the
E
key.
4. The baud rate will be selected automatically.
The last two format settings allow the GPS 90
to accept 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
interface, with the baud rate selectable from the GPS 90.
The RTCM/NMEA selection controls the GARMIN GBR-
21 beacon re c e i v e r. Once a RTCM setting has been
selected, the GPS 90 will automatically 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 previous beacon has been tuned. You may also
enter your own frequency and bit rate if desired.
To enter a DGPS beacon frequency:
1. Highlight the ‘freq’ field and press
E
.
2. Enter the desired frequency and press
E
.
3. Highlight the ‘rate’ field and press
E
.
4. Use
U
and
D
to select the rate and press
E
.
49
Setup Menu
NMEA Formats
& DGPS
Selecting an NMEA
format.
Receiving DGPS
corrections.
gps 90 manual 8/6/98 10:00 AM Page 49
