Garmin GPS 120XL User Manual download pdf (Page 48)

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 with-

out RTCM input), the NMEA field will become high-

lighted. NMEA formats 0180, 0182 or 0183 (1.5 or 2.0)

are available.

To select a NMEA format:

1. Press

to begin a NMEA selection.

2. Use

and

to select a format, and press

DGPS Interface

The last two format settings allow the differential-

ready GPS 120XL to accept RTCM DGPS corrections in

RTCM 104 version 2.0 format. Using DGPS corrections

will improve receiver accuracy to 5-10 meters, regard-

less of errors induced by the U.S. government’s Selective

Availability (SA) program. The RTCM/NONE format

will allow connection to any manually tuned beacon

receiver by using the proper output interface. The baud

rate is selectable from the GPS 120XL.

The RTCM/NMEA selection controls the GARMIN

GBR-21 differential beacon receiver. Once a RTCM set-

ting has been selected, the GPS 120XL will either 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 previous beacon

has been tuned. You may also enter your own frequency

and bit rate if desired.

DGPS Interface

REFERENCE

The ‘NONE/NMEA?’ set-

ting makes it possible to

output data to output infor-

mation to devices like chart-

plotters and autopilots.

The selectable baud rate is

available for all RTCM

interface options.

120XL Man RevB 7/10/98 10:55 AM Page 44

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Garmin GPS 120XL User Manual Page 48

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