Position Alert

This app let's you set specific areas from the map and trigger an alarm when you're there.
Perfect if you want to sleep in the train or a bus going home or work.
Useful for remaining hotspots in a city if you're a tourist.
Don't miss a shop in the way home, maybe you need to buy milk.
Don't worry about exits in the highway, just put a marker and set the alert radius to 1km.