Garmin G500, Руководство пилота

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9-24 Pilot’s Guide 190-01717-10 Rev. H
Abnormal Operations
9.4.2 Backup GPS
Each GDU is equipped with a backup GPS receiver. When the optional Garmin
backup GPS antenna is connected, and if all the certified GPS sources are lost, the
system provides 2-D GPS position information from the backup GPS. No pilot action
is required to enable the use of backup GPS data.
Only one GDU in a multi-GDU installation requires a connected backup GPS antenna.
The system automatically cross-fills backup GPS data between GDUs.
Backup GPS data is used only to provide non-safety critical functions and only after
the failure of all certified GPS position sources. Backup GPS data is only provided
when a valid GPS position is received from an airborne certified GPS source that is
subsequently lost. The system always utilizes time from the backup GPS when no
other source is available, even prior to receipt of GPS time from a certified GPS
source.
Backup GPS data provides:
•
Ownship position on the moving map
•
GPS track display
•
Waypoint bearing/distance information
•
Ground speed
•
Wind calculations
When backup GPS is in use:
•
Yellow “BACKUP GPS” annunciation displays on all geo-referenced maps
•
Navigation using backup GPS is not provided
•
Map overlays for Stormscope, traffic, terrain, and obstacles are disabled
•
Traffic page continues to display data from TIS-A and TCAS sources
Functions inhibited with backup GPS:
•
Bearing pointer on Waypoint Info page
•
Chart geo-referencing
•
SVT
•
GPS altitude displays
•
GPS navigation status field
•
TAWS/terrain alerting
•
Terrain page display