190-00709-05 Rev. D
Garmin G1000 Pilot’s Guide for the Socata TBM 850/900
29
SYSTEM OVERVIEW
GPS RECEIVER OPERATION
Each GIA 63W Integrated Avionics Unit (IAU) contains a GPS receiver. Information collected by the specified
receiver (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. Internal
system checking is performed to ensure both GPS receivers are providing accurate data to the PFDs. In some
circumstances, both GPS receivers may be providing accurate data, but one receiver may be providing a better
GPS solution than the other receiver. In this case the GPS receiver producing the better solution is automatically
coupled to both PFDs. “BOTH ON GPS 1” or “BOTH ON GPS 2” are then displayed in the Reversionary Sensor
Window (see Appendix A) indicating which GPS receiver is being used. Both GPS receivers are still functioning
properly, 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 has
acquired satellites before the other, or one of the GPS receivers has not yet acquired an SBAS (Satellite Based
Augmentation System) signal. While the aircraft is on the ground, the SBAS signal may be blocked by
obstructions causing one GPS receiver to have difficulty acquiring a good signal. Also, while airborne, turning
the aircraft may result in one of the GPS receivers temporarily losing the SBAS 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 information
1)
Use the large
FMS
Knob to select the Auxiliary Page Group (see Section 1.7 for information on navigating MFD
page groups).
2)
Use the small
FMS
Knob to select GPS Status Page.
Selecting the GPS receiver for which data may be reviewed
1)
Use the
FMS
Knob to select the AUX - GPS Status Page.
2)
To change the selected GPS receiver:
a)
Select the desired
GPS
Softkey.
Or
:
a)
Press the
MENU
Key.
b)
Use the
FMS
Knob to highlight the receiver which is not selected and press the
ENT
Key.
