Great for friends actively trying to find each other – Friend Mapper Review

This app is like the Marauder's Map (of Harry Potter fame) for your mobile device! The biggest limitation (and it's an iPhone limitation since these apps aren't allowed to run in the background) is you have to be running the app in order for your position to be sent to your friends. On the iPhone if you go back to home, the app stops running.
Review by danericryan on Friend Mapper.