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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 300 will
have adequate satellite geometry to work with during your flight. RAIM availability
will be near 100% in Oceanic, En route, and Terminal phases of flight. Because the
FAA’s TSO requirements for non-precision approaches specify significantly better
satellite coverage than other flight phases, RAIM may not be available when flying
some approaches. The GNC 300 will automatically monitor RAIM during approach
operations and warn you if RAIM is not available. RAIM prediction will help you plan
for a pending flight to confirm that the GNC 300 can be used for an approach, and
should be calculated the night before or the day of the desired flight.
To predict RAIM availability:
1. Press
C
twice and rotate
O
to highlight ‘RAIM prd?’. Press
E
.
2. Rotate
O
to highlight the field which you would like to change.
3. Use
K
and
O
to enter the waypoint name, or leave it blank to use your current
position. Press
E
to accept. OR:
Use
K
and
O
to enter the day, month and year of the information desired. Current
date will be displayed automatically. Press
E
to accept.
4. Rotate
O
to highlight ‘Compute RAIM?’.
5. Press
E
to compute information.
When the computations are complete, the GNC 300 will display whether or not
RAIM is available for the specified waypoint at the specified date and time.
26
REFERENCE
Comm Features
Confirm the selected waypoint.
Enter the time and date for RAIM prediction.
RAIM available for the entered time and date.
SECTION
1
NAV KEY
NAV Menu 2
RAIM Prediction
300 7/14/98 8:49 AM Page 26