A group of us went out for a flight today and all was good aside from one member of the group having a faulty altitude reading saying -2.14xxxxxx metres. Exactly as mentioned here:
Stabilise mode works fine, but obviously alt.hold and loiter would just kill the motors.
The member tried resetting the APM, re-flashing the latest version of Arducopter, but nada. Does anyone have an idea why this may have happened or how to fix it?