190-00709-00 Rev. A Garmin G1000 Pilot’s Guide for the Socata TBM 850 1-25SYSTEM OVERVIEWFigure 1-21 MFD SoftkeysMAP DCLTRTRAFFIC TOPO BACKTERRAINDCLTR-2DCLTR-3DCLTR-1Select the BACK Softkey on this level toreturn to the top softkey level.NEXRAD XM LTNG(optional)(optional)CAS SHW CHRT CHKLIST(optional)(optional)AIRWAYSAIRWY LOAIRWAY HIAIRWY ONCAS ↓CAS ↑SYSTEMSYSTEM CAS MAP ELEC CHKLISTFUEL GENSTRMSCPRA TESTGPS RECEIVER OPERATIONEach GIA 63W Integrated Avionics Unit (IAU) contains a GPS receiver. Information collected by the specifiedreceiver (GPS1 for the #1 IAU or GPS2 for the #2 IAU) may be viewed on the AUX - GPS Status Page.GPS1 provides information to the pilot-side PFD and GPS2 provides data to the copilot-side PFD. Internalsystem checking is performed to ensure both GPS receivers are providing accurate data to the PFDs. In somecircumstances, both GPS receivers may be providing accurate data, but one receiver may be providing a betterGPS solution than the other receiver. In this case the GPS receiver producing the better solution is automaticallycoupled to both PFDs. “BOTH ON GPS 1” or “BOTH ON GPS 2” are then displayed in the Reversionary SensorWindow (see Appendix A) indicating which GPS receiver is being used. Both GPS receivers are still functioningproperly, but one receiver is performing better than the other at that particular time.These GPS sensor annunciations are most often seen after system power-up when one GPS receiver hasacquired satellites before the other, or one of the GPS receivers has not yet acquired a WAAS signal. Whilethe aircraft is on the ground, the WAAS signal may be blocked by obstructions causing one GPS receiver tohave difficulty acquiring a good signal. Also, while airborne, turning the aircraft may result in one of the GPSreceivers temporarily losing the WAAS signal.If the sensor annunciation persists, check for a system failure message in the Messages Window on the PFD.If no failure message exists, check the GPS Status Page and compare the information for GPS1 and GPS2.Discrepancies may indicate a problem.Viewing GPS receiver status information1) Use the large FMS Knob to select the Auxiliary Page Group (see Section 1.7 for information on navigating MFDpage groups).2) Use the small FMS Knob to select GPS Status Page.Selecting the GPS receiver for which data may be reviewed1) Use the FMS Knob to select the AUX - GPS Status Page.
