User manual

U-See User Manual - Map View
2.5.2.1 Optionally available map overlays
When operating in moving base mode and the feature is enabled, next to the base position
an overlay with information about course and speed of the moving base will be displayed.
This information is only available in some U-See versions and this section may not apply to
your version
2.5.3
2.5.3
GPWS Information display
GPWS Information display
GPWS is the acronym for Ground Proximity Warning System. When active (See 2.12.10.3
Maps & DEM configuration
4
) a circular gridded sector covering the aircraft’s surrounding 8
km. will be displayed.
Aircraft is located at its centre. Innermost sector is a 300 m. circle which state is the worst
of the surrounding adjacent grid elements.
At every corner of each grid element ground clearance is checked. Ground clearance is
computed as current aircraft altitude minus the digital elevation model predicted terrain
elevation at the element coordinates. The lowest ground clearance is checked against the
configured GPWS warning levels (See 2.12.10.1 Alarms & Warnings):
• Ground clearance is negative of lower than the configured critical warning level.
Grid element will be red coloured. This means that the terrain at that location is
higher than current aircraft altitude, and a fly-to to this location without increase of
altitude will surely cause a loss of the aircraft because if a controlled flight into the
terrain.
• Ground Clearance is between the critical and warning level. Grid element will be
yellow coloured. This means that while theoretically the ground should be lower that
current altitude, antennas, man-made obstacles, digital elevation model errors,
trees and other inaccuracies still pose a danger for the aircraft. A fly-to to these
coordinates may cause problems for the aircraft.
4 DEM is an acronym for Digital Elevation Model
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Ilustración 1: GPWS information display in action