Just been trying to work this out.. I downloaded the app and using activesync internet managed to browse around without any issues..
During this time i am watching my phone through Explorer on my PC trying to see where the data is going. I browsed up 3MB of maps yet couldnt see where it was going..
i was thinking if i could find where the files were going maybe i could move them elsewhere or restrict google maps access in removing them at the end..
there is also this write up which could help..
Surely if anyone can work this out it has to be the guys here