Uses real GPS satellites, cellular tower networks and WiFi slots to determine the device (iPad or iPhone) location!
Uses info from your contacts about your friends.
Imagine telling your friends that you can ALWAYS track location of their phone ANYWHERE in the world and they probably won't believe you... Then go ahead, enter their phone number and click LOCATE - they'll be amazed and shocked, to say the least!
In reality, this app always tracks location of your phone and since your friends are likely to be next to you they'll think that you actually track their location. Yeah, go ahead and tell them: BIG BROTHER IS WATCHING! Your friends will think that you have an access to a secret database while you will be just using the info stored in your contacts.