As soon as I enter a route, the aircraft icon at the bottom of the terrain/runway display disappears. If I delete it, the aircraft icon comes back.
Hello,
as soon as you take off, youll see the icon.
Just try it out during the flight.
Unfortunately, it was like that on the flight.
Which version of VFRnav is installed?
Which device is it?
…I’ll add: you can also test it in an air-conditioned car 
…it’s all about movement.