I just found that I couldn't understand most of what is said unless I looked down to see the turn instructions on the screen as well.

Which brings me to something that I'd consider to be a much more useful modification to GPSapp:

- Give it a pop-up mode, where it stays on the music/player screen most of the time, and only pops up to show you the map screen when you are approaching a turn.

- Have it give an audio notification that there is an approching turn, so you know to look down at the screen when it happens. The audio notification could be mixed in with the music, as a beep or as a voice saying "turn approaching" or whatever. Heck, you could even supply your own wave file for it.