Nav key – Garmin GNC 250XL User Manual
Page 40
Enter the time and date for RAIM prediction.
SECTION
1
NAV KEY
RAIM Prediction
RAIM available for the entered time, date and
waypoint location.
The RAIM Prediction function allows you to confirm that GPS coverage is
available for a specific location or waypoint any day of the year. Receiver
Autonomous Integrity Monitoring performs checks to ensure that the GNC 250XL
will have adequate satellite geometry to work with during your flight. RAIM availabil-
ity will be near 100% in Oceanic, En route and Terminal phases of flight.
To predict RAIM availability:
1. Press
N
and rotate
O
until NAV Menu 2 is displayed.
2. Press
C
twice and rotate
O
to highlight ‘RAIM Prd?’. Press
E
.
3. Rotate
O
to highlight the field which you would like to change.
4. Use
K
and
O
to enter the waypoint name, or leave it blank to use your current
position. Press
E
to accept.
5. Use
K
and
O
to enter the ETA in hours and minutes (in local or UTC time, whichever
you have selected from the clock display), and the day, month and year. The current date
will be displayed automatically. Press
E
to accept.
6. Rotate
O
to highlight ‘Compute RAIM?’.
7. Press
E
to compute information.
When the computations are complete, the GNC 250XL will display whether or
not RAIM is available for the specified waypoint at the specified date and time. Refer
to the table on page 78 for specific RAIM protection limits as they relate to CDI scale
figures.
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250xl manual 2 7/17/98 1:27 PM Page 30