Tiled Maps lets you carry the world with you, even when you're out of network range. Build your own maps using the TMS standard and load your iOS device up before you hit the road. Tiled Maps can show you your exact location on the map and even orient the map to which ever way you're facing.
Rotating maps
Try it here
Tap the tracking icon to make Tiled Maps follow your location on screen. Tap it again to orient the map to which ever way you are facing (requires device with a digital compass).
Try it here
Offline maps
Maps are held on your device, so you'll still have maps even when you lose cellphone reception.