Ive wandered around the city for two days with this app - and I know Centrum fairly well - and its great. Get the GPS version. Tracks accurately 90% of the time maybe 50 yards off on occaision / corrects with movement. Real time synchronization lets you follow your travels on the tram. Best of all - youre not constantly looking at a paper map - youre looking at your iPhone - just like the locals.
Bim Steve about The Map - Amsterdam