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190-00592-06 Rev. A
Garmin G1000 Pilot’s Guide for the Diamond DA40/40F
15
SYSTEM OVERVIEW
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICES INDEX
For WAAS-enabled systems, 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 a WAAS
signal. While the aircraft is on the ground, the WAAS 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 WAAS signal. If no failure message exists, check the GPS Status Page
and compare the information for GPS1 and GPS2. Discrepancies may indicate a problem.
GPS RECEIVER STATUS
The GPS solution type (ACQUIRING, 2D NAV, 2D DIFF NAV, 3D NAV, 3D DIFF NAV) for the active
GPS receiver (GPS1 or GPS2) is shown in the upper right of the GPS Status Page. When the receiver is
in the process of acquiring enough satellite signals for navigation, the receiver uses satellite orbital data
(collected continuously from the satellites) and last known position to determine the satellites that should be
in view. ACQUIRING is indicated as the solution until a sufficient number of satellites have been acquired
for computing a solution.
When the receiver is in the process of acquiring a 3D navigational GPS solution, 3D NAV is indicated as the
solution until the 3D differential fix has finished acquisition. Satellite-Based Augmentation System (SBAS)
status should be indicated as INACTIVE at this point. When acquisition is complete, the solution status
changes to 3D DIFF NAV and SBAS becomes active.
In certain situations, such as when the aircraft is outside or on the fringe of the WAAS or MSAS (used only
in Japan) coverage area, it may be desirable to disable WAAS or MSAS (although it is not recommended).
When disabled, the SBAS field in the GPS Status box indicates DISABLED. There may be a small delay for
the GPS Status box to be updated upon WAAS and MSAS enabling/disabling.
Disabling WAAS or MSAS
1) Select the GPS Status Page.
2) If necessary, press the SBAS Softkey.
3) Press the
FMS
Knob
, and turn the large FMS Knob to hightlight ‘MSAS’ or ‘WAAS’.
4) Press the ENT Key to uncheck the box.
5) Press the FMS Knob to remove the cursor.
Figure 1-12 Enable/Disable WAAS