I'm working on a simple location-aware game where the current location of the user is shown on a game map, as well as the locations of other players around him. It's not using MKMapView but a custom game map with no streets.

How can I translate the other lat/long coordinates of other players into CGPoint values to represent them in the world scale game map with a fixed scale like 50 meters = 50 points in screen, and orient all the points such that the user can see in which direction he would have to go to reach another player? 

The key goal is to generate CGPoint values for lat/long coordinates for a flat top-down view, but orient the points around the users current location similar to the orient map feature (the arrow) of Google Maps so you know where is what.

Are there frameworks which do the calculations?