This is an app that can wake you up when you're at particular locations.
You must know something named alarm clock, where clock means something you can learn the time from, and when it's at particular time, this thing will alarm.
So, alarm map is just like that. You can learn where you are from a map. And if you need something to alarm you up when you're at some particular location, alarm map is what you need.
Well, I came up the idea when I was on the shuttle bus. As a developer I usually get exhausted after work (poor developers) and I sleep on the shuttle bus. Sometimes I might fall asleep and skip the bus stop where I should get off.
So if you have the same problem as I do, you will find it useful.