Sadly, the RC shows some useless things, such as E/V and SD csrd presence, but not the compass reading, which could be useful just for this. Trial and error with the distance reading pretty much means you trust the RTH location, cause thats the distance it shows. As long as you have the RTH altitude set high enough, don't bother poiting it at you with the distance reading, just use RTH. I have to say the Go4 app really is unstable, and i already had to bring it back with the failed app once, but the app has failed while the machine has been looking, more or less, in my direction, so i didn't have to RTH, just go higher and fly forward.