Yeah, I've seen (and have) a couple of apps that can display a route but if I'm not sure how far ahead a turn is (hundreds of few or a few miles) it's so annoying to keep glancing down at the map. I want audio directions!

I just spent another hour this morning trying to find a GPS app for the iphone with turn-by-turn directions based on a custom route that I generate. I can't find any!

EDIT: Oops, hadn't seen that last post. Let me look into that... Is Courses an iPhone app? I don't see it... I wouldn't mind hand-adding directions in advance if there's an iphone app that can use the resulting file. Battery life isn't an issue if I'm getting audio turn-by-turn because with the display off I get 6 hours. I also have a small supplemental battery that'll plug in and give me more time.