Wjen the lesson starts you're told to maintain 160 deg and 5000 feet. Even if following those instructions precisely, a few minutes later you're told that youre too far west. Then you're "out of bounds."
On the design: X Plane is by far the best mobile flight simulator. The interface, however, would be much better if, instead of tilting the entire image when the device is moved, tilting the device should only affect the yoke. The horizon should not move (from the user's perspective) except as a result of the bank of the plane. Hopefully you can consider such a change in the next mobile version.