Garmin G1000 Quest Kodiak - Manual (Page 325)

190-00590-00 Rev. C Garmin G1000 Pilot’s Guide for the Quest Kodiak 100 D-1
APPENDIX D
FREQUENTLY ASKED QUESTIONS
If a particular aspect of G1000 operational capability is not addressed by these commonly asked questions or in
the index, contact Garmin (see the copyright page or back cover for contact information) or a Garmin-authorized
dealer. Garmin is dedicated to supporting its products and customers.
W
HAT IS
WAAS?
The Wide Area Augmentation System (WAAS) uses a system of ground stations to correct any GPS signal
errors. The WAAS is designed to provide the additional accuracy, availability, and integrity necessary to enable
users to rely on GPS for all phases of flight. WAAS is currently available in the United States, including Alaska
and Hawaii.
H
OW DOES
WAAS
AFFECT APPROACH OPERATIONS
?
Both LNAV/VNAV and LPV approaches use the accuracy of WAAS to include vertical (glide path) guidance
capability. The additional accuracy and vertical guidance capability allows improved instrument approaches to
an expanded number of airports throughout the U.S.
The implementation of LPV approaches further improves precision approach capabilities. LPV approaches
are designed to make full use of the improved GPS signal from the WAAS. This approach combines the LNAV/
VNAV vertical accuracy with lateral guidance similar to the typical Instrument Landing System (ILS). LPV
approaches allow lower approach minimums.
W
HAT IS
RAIM
AND HOW DOES IT AFFECT APPROACH OPERATIONS
?
NOTE: In a WAAS certified system, RAIM prediction is no longer computed automatically, nor is it required
to be performed manually. If outside the WAAS coverage area, manual prediction can still be accomplished
if desired.
RAIM is an acronym for Receiver Autonomous Integrity Monitoring. RAIM is a GPS receiver function that
performs the following functions:
• Monitors and verifies integrity and geometry of tracked GPS satellites
• Eliminates a corrupt satellite from the navigation solution
• Notifies the pilot when satellite conditions do not provide the necessary coverage to support a certain phase
of flight
• Predicts satellite coverage of a destination area to determine whether the number of available satellites is
sufficient to satisfy requirements
NOTE: If RAIM is not predicted to be available for the final approach course, the approach does not become
active, as indicated by the “RAIM not available from FAF to MAP” message and the LOI annunciation
flagging on the HSI.
For RAIM to work correctly, the GPS receiver must track at least five satellites. A minimum of six satellites is
required to allow RAIM to eliminate a single corrupt satellite from the navigation solution.