Link Up allows users to connect with each other and share real time GPS data (only with your permission) without the use of a heavy map. You may also save or send locations to other users for later use. Locations are expressed in range/direction and multiple users may connect with each other at once. A connection is initiated when both users agree to connect and is terminated when either user decides to end the connection.
This application is great when vacationing or hiking with a group of friends to keep up with one another in short or long distance and to help any two users keep track of each other when needed until terminated by either user. A connection will remain active even while the app is minimized and the phone is idle.