15: Safe Mode
When Topo Maps starts, it tries to resume with the same view that you were viewing before you last quit. A potential danger with this is that if the app crashes for some reason, when you restart it it may immediately encounter the same problem and crash again.
Safe Mode is designed to avoid this potential problem. If it seems that the app has got into a bad state, go to your device's main settings app and chose Topo Maps:
Turn on Safe Mode and the next time the app starts it will not try to restore its previous state; instead it will show a default view of the U.S. satellite map.
Note that Safe Mode does not erase your maps or waypoints or anything else of that sort.
To date, no bugs have been reported that need Safe Mode for recovery. The feature has been added purely as a precaution.