Garmin GPS Receiver User Manual page 3

1.2 DETERMININg WhEN A WFDE PREDICTION IS REquIRED
The WFDE Prediction Program determines whether the GPS constellation is robust enough to provide a navigation solution
for the specified route of flight. As required (dependent upon type of flight plan, GPS Software (SW) version, and GPS antenna),
prior to departure the operator must use the WFDE Prediction Program supplied with the applicable trainer or route planning
software to demonstrate that there are no outages in the capability to navigate on the specified route of flight (Table 1).
NOTE: If the route of flight requires an alternate airport, multiple predictions may be required (one for the primary and
one for the alternate) to verify RAIM and/or WAAS satellite availability at the primary and the alternate approach.
A WFDE Prediction is required for the following instances (see also Table 1):
• For all Garmin WAAS enabled units (regardless of the GPS software version or antenna model): an FDE prediction is
required for operations where the route requires Class II Navigation (e.g. Oceanic/Remote operation) and GPS is to be
the primary source of navigation per FAA AC 20-138A Appendix 1. The Oceanic/Remote flight phase occurs when the
flight plan will place the aircraft more than 200 nautical miles from the nearest airport. All operators using a Garmin
WAAS-certified unit as primary means of navigation in oceanic/remote areas under FAR parts 91, 121, 125, and 135
must utilize the WFDE Prediction Program prior to conducting a flight in these areas.
• For all Garmin WAAS enabled units (regardless of the GPS software version or antenna model): a RAIM prediction is
required for operations in areas where SBAS coverage is not available.
• For Garmin WAAS enabled units using an unapproved* GPS antenna (regardless of the GPS software version): a RAIM
prediction is required for all flight operations in accordance with the National Aviation Authority guidelines for TSO-
C129a equipment. Examples of such operations include navigation of U.S. Area Navigation (RNAV) routes, Standard
Instrument Departures (SIDs), or Standard Terminal Arrival Routes (STARs) per FAA AC 90-100A "U.S. Terminal and
En Route Area Navigation (RNAV) Operations".
• For Garmin WAAS enabled units using an unapproved* GPS antenna (regardless of the GPS software version): an
operational limitation in the form of a WAAS satellite visibility prediction is required for all LNAV/VNAV, LP, or LPV
approaches.
• For Garmin WAAS enabled units with GPS Software v2.XX or earlier (regardless of GPS antenna model): an operational
limitation in the form of a WAAS satellite visibility prediction is required for all LNAV/VNAV, LP, or LPV approaches.
A WFDE Prediction is not required for the following instances (see also Table 1):
• For Garmin WAAS enabled units with GPS Software v3.XX or later and using an approved* GPS antenna: a RAIM
prediction is not required when operating in areas where SBAS coverage is available.
• For Garmin WAAS enabled units with GPS Software v3.XX or later and using an approved* GPS antenna: a WAAS
satellite visibility prediction is not required for LNAV/VNAV, LP, or LPV approaches.
Oceanic/Remote
Enroute/Terminal
LNAV/VNAV, LP, or LPV Approach
Oceanic/Remote
Enroute/Terminal
Enroute/Terminal
LNAV/VNAV, LP, or LPV Approach
LNAV/VNAV, LP, or LPV Approach
Operations outside SBAS coverage
190-00643-01 Rev. E
190-00643-01_0E.indd 3
Route Type GPS SW Version
2.XX or earlier
2.XX or earlier
2.XX or earlier
3.XX or later
3.XX or later
3.XX or later
3.XX or later
3.XX or later
All versions
GARMIN WAAS FDE PREDICTION PROGRAM INSTRUCTIONS
WFDE PREDICTION PROgRAM INSTRuCTIONS
Antenna Type* WFDE Prediction Required?
Approved/Unapproved
Approved/Unapproved
Approved/Unapproved
Approved/Unapproved
Approved
Unapproved
Approved
Unapproved
Approved/Unapproved
Table 1
YES
YES
YES
YES
NO
YES
NO
YES
YES
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