Garmin GPS Receiver 635 User Manual Page 262

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14-10
Garmin GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. B
Foreword
Getting
Started
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Music
Utilities
System
Messages
Symbols
Appendix
Index
14.3 RAIM Prediction
RAIM Prediction predicts if GPS coverage is available for your current location
or at a specified waypoint at any time and date. RAIM performs checks to
ensure that the GTN unit has adequate satellite geometry during your flight.
RAIM availability is near 100% in Oceanic, En Route and Terminal phases
of flight. Because the FAAs 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 GTN unit
automatically monitors RAIM during approach operations and warns you if
RAIM is not available. In such cases, use a non-GPS based approach. RAIM
prediction helps you plan for a pending flight to confirm GPS operation during
an approach.
RAIM prediction only predicts the availability of Fault Detection (FD)
integrity in the absence of SBAS corrections. It cannot predict the availability
of LPV or L/VNAV approaches. The FAA provides a NOTAM service for LPV
approach availability.
1. While viewing the Utilities page, touch the RAIM Prediction
key.
Touch To Select
Local Arrival Time
Touch To Select
Destination
Waypoint
Touch To Select
Local Arrival Date
Figure 14-13 Utility RAIM Prediction Page
2. Touch the Waypoint key and select the waypoint for RAIM
Prediction.
3. Touch the Arrival Date key and select the date of arrival at
the selected waypoint.
4. Touch the Arrival Time key and select the local time of
expected arrival at the selected waypoint.
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