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If you choose airspace alerts, you can select:
whether or not alert messages are issued
the type of message - Class B and C,
Special Use (Restricted, Danger), or All
the radius distance from the airspace
border at which to be alerted
the travel time (based upon current track
and speed) from the airspace border at
which to be alerted
Special Note: The type of message selected
here also controls the type of airspaces
displayed on the map screens and on the
message page.
If the receiver is computing a 3D position fix,
the GPS altitude will be used to avoid an alert
message when above or below the airspace
ceiling or floor. To compensate for the
inaccuracies of GPS altitude, a buffer of 1,000
feet is added to the ceiling and subtracted from
the floor. For example, if the published ceiling
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