Iphone Phone radar app sharing

Hello, I am trying to get radar mobile Iphone phone app but could find only one on Android market.

It's called someoneradar.

Basically, this app is simple. It uses phone compass and internet connection to show location to other using the same app around. When it were connected, it connects Someoneradar users when they are in a certain distance by displaying an arrow pointing to someone else using Someoneradar.

Anybody has the same function of app? Let's compare here and discuss