Altair Glide Computer and Navigation System User Manual Page 73

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7 AIRSPACE, TRAFFIC AND TEAM FLYING
The default colouring of Class C, D, E and F airspace is consistent with ICAO charts.
7.2 Incursion events
Three types of events are detected by XCSoar in relation to SUA:
Predicted incursion This event is detected when the glider is estimated to be on a track that will
result in entering the airspace at a set time in the future. The time is the ’airspace warning
time’ configuration setting.
The use of a long term average track in these calculations means that the system can still
predict incursion even when drifting in the wind when circling.
Entering This event occurs when the glider enters an airspace region.
Leaving This event occurs when the glider leaves an airspace region.
In all cases, the boundary of the region is defined by maximum and minimum altitudes or flight
levels, as specified in the airspace file.
Airspace warnings are still issued even if the incursion region is off-screen.
Where a barometric altitude source is available, it is used preferentially to GPS altitude in detecting
airspace incursions. This makes the system conform to normal conventions of having airspace
violations based on QNH-adjusted altitude.
7.3 Airspace warning levels
The concept of airspace warning levels is introduced:
0 Aircraft is outside and distant from airspace.
1 Aircraft is predicted to penetrate the airspace but is not close.
2 Aircraft is predicted to penetrate the airspace and is close to doing so.
3 Aircraft is inside airspace.
At all times XCSoar monitors the aircraft relative to all airspace and maintains warning levels for
each. The airspace warnings are still filtered according to the airspace filter preferences; such that
certain categories of airspace may be effectively disabled.
The sequence of events when entering an airspace results typically in three warnings: when near
(level 1), when close (level 2), and when inside (level 3).
Whenever the warning level increases (above level 0) for any airspace, the airspace warning dialog
appears, accompanied by a system beep. When there are no more airspace regions at warning
levels above 0, the dialog disappears automatically.
XCSoar Manual (Altair version) XCSoar-A-EN 66
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