Wander

Wander helps you find your friends at festivals, concerts, or just at the beach.

Wander enhances your phones internal GPS by using metadata from other nearby devices. This means you'll be able to find your friends indoors or in other areas with poor GPS.

You have total control over which friends can see your location. You can temporarily block or allow specific friends, or go totally off-the-gird at any moment.

You can leave your phone in your pocket and even turn off the ringer! Your friends will still be able to find you. The app uses the latest energy-efficient techniques to update your location in the background.

Update 7-12-2015: p2p is not yet supported on the Android version but should be available in a few weeks.