Cooee Mate

Cooee Mate is a location and communication app.  Users create a friends list and when two friends are logged into the app they can share and track their movements using their phones’ GPS.  The app also has a free text chat feature that connected friends can use. 
You could use Cooee Mate to locate your mates at a music festival or other outdoor event.    
The app can also be used to send an email containing your location to a large group of people that are not Cooee Mate users.  This is ideal if you are trying to organise a meeting with people and you need to communicate your exact location in real time.