The is truly one of the handiest apps I've found. The Maps Ruler calculates the distance between selected points. It helps you find the shortest way from one location to another or calculates the distance for a route you wanty to take. It is a must have on your cell phone if you are a hiker, runner a biker, a driver or even a pilot. It's even sensitive enough to use on the golf course or while fishing in a boat on a river or a lake.