I've played around with it, and the various "shake-rattle-and-tilt" options seems to be well thought out and work reasonably well. I think it is only a matter of time/training before this way of manipulating the map becomes natural. Must probably fine-tune the sensitivity settings a bit to suit me better, kudos for including functionality to do that.

What I miss (and think you should give priority when developing this app further):
- We've discussed the "cant override the screen lock" - problem I have on my phone. But on phones without company policy restrictions I think it will important with a well thought out, hassle-free method of locking and unlocking the screen.

- A quick way of sentering the map on your current position _*without*_ clicking the icon on the screen.

I have no idea of how that can be achieved. You seem to have made good use of the various shake-rattle-and-roll options I can think of. But there's still the power button, or the volume buttons (both the volume up and volume down may be assigned the same function).