User Manual UX11
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5.4.4
Setting a geofence
A geofence is a virtual boundary the aircraft cannot fly through. Whatever happens, the aircraft will
stay within a restricted airspace. It can be horizontal (a circle or a polygon) and/or vertical (a ceiling).
The set geofence is strictly respected by creating a safety buffer (100m horizontally and 20m vertically)
that prevents the aircraft from accidentally exceeding the boundaries.
• If the aircraft comes inside the safety buffer, it will automatically try to move away from the
boundary. Once out of safety buffer, it resumes its previous navigation target.
• If the aircraft stays inside the safety buffer for too long, it will eventually abort the mission and
go to landing (level 2 alarm).
• If the aircraft exceed specified boundary it triggers the fail-safe procedure (level 4 alarm).
• It is not possible to execute a flight plan that goes into the safety buffer or exceed boundary.
Example: if you set the flight height to 122m then you have to set the geofence ceiling at least
20m above, i.e. 142m. You will not be able to plan and execute a flight plan that goes above 122m.
Whatever happens, during flight aircraft will automatically avoid going higher. If, because of strong
weather or any failure, aircraft goes above 142m it will trigger the FTS.
Geofence ceiling is set above aircraft initialization point while flight plan is set above terrain.
Depending on terrain, flight height may be higher than ceiling even if using the same value. Elevation
graph allows you to check that your flight plan is lower than your ceiling (including the safety buffer),
See
Viewing the flight plan elevation on page 33
.
Figure 5-2 Setting a geofence (circle).
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