190-01263-01 Rev. A
Garmin G2000 Pilot’s Guide for the Cessna T240
39
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INSTRUMENTS
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AUDIO & CNS
FLIGHT
MANA
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HAZARD
AV
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AFCS
ADDITIONAL
FEA
TURES
APPENDICES
INDEX
measures of horizontal and vertical position uncertainty, are the current 95% confidence horizontal and
vertical accuracy values reported by the GPS receiver.
The current calculated GPS position, time, altitude, ground speed, and track for the aircraft are displayed
below the satellite signal accuracy measurements.
GPS RECEIVER STATUS
The GPS solution type (ACQUIRING, 2D NAV, 2D DIFF NAV, 3D NAV, 3D DIFF NAV) for the active GPS
receiver (GPS 1 or GPS 2) is shown in the right center of the GPS 1 and GPS 2 STATUS Pane. 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. SBAS (Satellite-Based Augmentation System)
indicates INACTIVE. When acquisition is complete, the solution status indicates 3D DIFF NAV and SBAS
indicates ACTIVE.
GPS SATELLITE SIGNAL STRENGTHS
The GPS 1 and GPS 2 STATUS Display can be helpful in troubleshooting weak (or missing) signal levels due
to poor satellite coverage or installation problems. As the GPS receiver locks onto satellites, a signal strength
bar is displayed for each satellite in view, with the appropriate satellite PRN number (01-32 or 120-138 for
WAAS) below each bar. The progress of satellite acquisition is shown in three stages, as indicated by signal
bar appearance:
- No bar—Receiver is looking for the indicated satellite
- Hollow bar—Receiver has found the satellite and is collecting data
- Light blue bar—Receiver has collected the necessary data and the satellite signal can be used
- Green bar—Satellite is being used for the GPS solution
- Checkered bar—Receiver has excluded the satellite (Fault Detection and Exclusion)
- “D” indication—Denotes the satellite is being used as part of the differential computations
Each satellite has a 30-second data transmission that must be collected (signal strength bar is hollow) before
the satellite may be used for navigation (signal strength bar becomes solid).
SBAS SELECTION
In certain situations, such as when the aircraft is outside or on the fringe of the WAAS, EGNOS, or MSAS
coverage area, it may be desirable to disable the reception of the applicable SBAS signal (although it is not
recommended). When enabled, the annunciator on the applicable button shows green.
Enabling/Disabling EGNOS, MSAS or WAAS
1)
From
Home
, touch
Utilities
>
GPS Status
.
2)
Touch the
EGNOS
,
MSAS
, or
WAAS
(any combination) Annunciator Button(s) to enable or disable. A green
annunciation indicates an enabled SBAS selection.
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