Usage examples are:
1. When sometimes you have a difficulty of finding your parked car.
2. You are a tourist, you go for a walk in unknown city. Simply save your location in front of your hotel and ask for direction from the app when you need to get back.
Simply open the app, wait until it retrieves your position, press "Save the location" and when you need to get back to that location, press the BIG arrow button and follow the arrow.