Altair Glide Computer and Navigation System User Manual Page 97

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XCSoar User Manual
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 preferen-
tially to GPS altitude in detecting airspace incursions. This makes
the system conform to normal conventions of having airspace vio-
lations 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 from Altair or the PDA. When there are no more airspace
regions at warning levels above 0, the dialog disappears automati-
cally.
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