My favorite so far. – Guru Maps - Navigate Offline Review

I've been using this for three years now, and love it. Get this app. Get MOBAC. Go offline anywhere you want. You can build layers from different maps. You can choose spots to get more or less detail and leave intermediary levels out to save disk space. Customize like mad, once you get really into it. This mapper is so awesome. Record routes, mark waypoints, export to other apps, and if you didn't quite make the ideal map, you can resort to the full state vector map you downloaded, just in case. Really, too cool for school.
Review by Lucknau on Guru Maps - Navigate Offline.