Flying a 'Track Me' mission ,and having set Maven to update the home point every 25 metres (I was walking along the beach), I got a red warning that said, 'Unable to Update Home Point' after walking about 100 metres.. The indicator in the bottom right of the screen showed that I still had a good GPS signal on my iPad so why wouldn't it update the home point? I'm sure it's something obvious but I can't think what. Any ideas?