Garmin G1000 Mooney M20TN - Manual (Page 365)

190-00647-00 Rev. A Garmin G1000 Pilot’s Guide for the Mooney M20M/M20R/M20TN 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
RAIM
AND HOW DOES IT AFFECT APPROACH OPERATIONS
?
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 INTEG 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.
RAIM ensures that satellite geometry allows for a navigation solution calculation within a specified protection
limit (2.0 nm for oceanic and enroute, 1.0 nm for terminal, and 0.3 nm for non-precision approaches). The
G1000 System monitors RAIM and issues an alert message when RAIM is not available (see Appendix A).
Without RAIM, GPS position accuracy cannot be monitored. If RAIM is not available when crossing the FAF,
the pilot must fly the missed approach procedure.
W
HY ARE THERE NOT ANY APPROACHES AVAILABLE FOR A FLIGHT PLAN
?
Approaches are available for the final destination airport in a flight plan or as a direct-to (keep in mind
that some VOR/VORTAC identifiers are similar to airport identifiers). If a destination airport does not have a
published approach, the G1000 indicates “NONE” for the available procedures.