190-00595-01 Rev. B Garmin G1000 Pilot’s Guide for the Beechcraft A36/G36SYSTEMOVERVIEW FLIGHTINSTRUMENTS EIS AUDIO PANEL& CNS FLIGHTMANAGEMENT HAZARDAVOIDANCE AFCS ADDITIONALFEATURES APPENDICES INDEX469APPENDIX DFREQUENTLY ASKED QUESTIONSIf a particular aspect of G1000 operational capability is not addressed by these commonly asked questions or inthe index, contact Garmin (see the copyright page or back cover for contact information) or a Garmin-authorizeddealer. Garmin is dedicated to supporting its products and customers.WHAT IS WAAS?The Wide Area Augmentation System (WAAS) uses a system of ground stations to correct any GPS signalerrors. These ground stations correct for errors caused by ionospheric disturbances, timing, and satelliteorbit errors. It also provides vital integrity information regarding the health of each GPS satellite. The signalcorrection is then broadcast through one of two geostationary satellites. This correction information can thenbe received by any WAAS-enabled GPS receiver.WAAS is designed to provide the additional accuracy, availability, and integrity necessary to enable users torely on GPS for all phases of flight. WAAS is currently available in the United States, including Alaska andHawaii.HOW DOES WAAS AFFECT APPROACH OPERATIONS?Both LNAV/VNAV and LPV approaches use the accuracy of WAAS to include vertical (glide path) guidancecapability. The additional accuracy and vertical guidance capability allows improved instrument approaches toan expanded number of airports throughout the U.S.The implementation of LPV approaches further improves precision approach capabilities. LPV approachesare 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). LPVapproaches allow lower approach minimums.WHAT IS RAIM AND HOW DOES IT AFFECT APPROACH OPERATIONS?RAIM is an acronym for Receiver Autonomous Integrity Monitoring. RAIM is a GPS receiver function thatperforms the following functions:• Monitors and verifies integrity and geometry of tracked GPS satellites• Notifies the pilot when satellite conditions do not provide the necessary coverage to support a certain phaseof flight• Predicts satellite coverage of a destination area to determine whether the number of available satellites issufficient to satisfy requirementsNOTE: If RAIM is not predicted to be available for the final approach course, the approach does not becomeactive, as indicated by the “RAIM not available from FAF to MAP” message and the LOI annunciationflagging on the HSI.
