Troubleshooting
Ground proximity
detected
∗∗
(if enabled)
The ground sensor on the drone has detected a
ground height above the ground of less than 30 m
during normal flight. Note: this feature should not
be depended on for avoiding obstacles, as the
ground sensor may fail to detect obstacles in cer-
tain environmental conditions⁵⁸.
Security action (if enabled): The drone circles the
current position while climbing to an altitude of 60 m
abovethe detected groundheight. Once this altitude
is reachedthe drone continues towards the next way-
point but sets the waypoint’s target altitude at 60 m
above the last detected ground height.
User action: Ensure that there are no obstacles such
as hills or buildings higher than the waypoints of your
flight plan.
Ground proximity
not detected
landing precision
decreased
∗∗
The ground sensor on the eBee was unable to detect
the proximity of the ground during a Linear landing
procedure. This may be due to an obstruction in the
sensor, low ambient light or low contrast in the envi-
ronment⁵⁹.
Security action: The drone continues the Linear
landing procedure but will initiate its final brake at
an estimated altitude of 20 m instead of 3 m (assum-
ing the Linear landing location is at the same altitude
at the Take-off location), resulting in decreased pre-
cision in the landing location.
User action: Be ready for the drone to overshoot
its planning Linear landing location by preparing a
larger obstacle-free zone around the location.
⁵⁸ see section ‘Linear landing’ on page 70
⁵⁹ see section ‘Linear landing’ on page 70
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