YUNEEC H850 Operation Manual page 52

To create the CORRIDOR SCAN, tap the Corridor Scan button after tapping the Mission Route
Setting icon.
If the transmitter is already connected to the drone and the drone GPS position was established,
the takeoff point will be set above the drone location, otherwise place the takeoff point at the
position you need then tap the "Done Adjusting" button to finish setting. Then the app will
switch to Corridor scan setting panel automatically.
There are 2 preset templates to choose for editing the Corridor Scan area.