I wish it was accurate
I bought this the night before a long cross country...just to try it out. I was not really expecting a great deal, but thought it was kind of cool. I was flying at 5500 and at a fairly consistent 150kts. I turned this on and kept an eye on it for 2.5 hr flight. It was occasionally right, but seemed to be incorrect more than correct. The heading was off by quite a bit (30+ degrees several times), as was the speed.
It might be a fun app, just not a very reliable one.
tarheel1 about
Aircraft Heading