Garmin GPS 12XL - Manual (Page 50)

DGPS Interface (continued)
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. Select the desired transmission rate, and press
E
.
When the GPS 12XL is receiving DGPS corrections
from the GBR 21, the ‘BEACON RECVR’ 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. At the bottom of the bea-
con receiver field, a status message will keep you
informed of DGPS activity:
• A ‘Tuning’ message will be displayed while a bea-
con signal is being tuned.
• Once the beacon signal has been tuned, a
‘Receiving’ message will be displayed.
• If a beacon signal is tuned and no corrections are
being received, a ‘No Data’ message will be dis-
played.
• If a beacon signal cannot be tuned, a ‘No Status’
message will be displayed.
The message page will alert you to any problems
relating to DGPS operation. You may also monitor the
DGPS status from the status field on the interface page.
The GPS 12XL will display one of three alert messages
concerning DGPS operation:
No DGPS Position— there is not enough data
available to compute a DGPS position.
No RTCM Input— the beacon receiver is not
properly connected or the baud rates do not match.
RTCM Input Failed— DGPS data was being
received but has been lost.
DGPS Interface
REFERENCE
46
The selectable baud rate is
available for all RTCM
interface options.
Alert messages will signal
any problems with DGPS
operation.
GPS 12XL Manual Rev C 7/10/98 11:19 AM Page 46