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Garmin GPS 120 User Manual

Page 54

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I/O jETWf-

HONE/NMEn

C3MER 0183 2.0

<1800 baud

I/O SETUP

RTCM/HMEfi

NMER 0183 2.0
<1800 baud

BEOCON REOEIUEk

FREO:

304.0KHZ

RATE!

25bps

MST ________ R,

»R

0dB

Tuning

I/O SETUP

RTCM/NMEfl

NI1ER 0183 2.0
<1800 baud

BEACON RECEIVER

FREQ: 30^.0KHZ

RATE:

25bps

BIST

35.8K»

SNR

38dB

Reteiumg__

The last two format settings allow the GPS 120

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 120,

Differential GPS is capable of correcting your

calculated position to be within 5-10 meters.
Differential correction transmitters are not avail­
able in all areas, however. Check local area
providers for service coverage.

The RTCM/NMEA selection controls the

GARMIN GBR-21 beacon receiver. Once a RTCM
setting has been selected, the GPS 120 will auto­
matically 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.

To enter a DGPS beacon frequency:

1. H ighlight the 'fieq' field and press

2. Enter the desired frequency and press

3. H ighlight the 'rate' field and press

4. Use the

a

. and ▼ keystoselectthe desired

transm ission rate.

5. Press the key to confirm your entry.

When the GPS 120 is receiving DGPS corrections

from the GBR-21, the ‘beacon received section of the
I/O setup page will display the beacon frequency and

signal strength, as well as the distance from the trans­
mitter to the beacon receiver.

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