Building a GPS-controlled Camera I've been trying to build an Arduino UNO controlled Camera using two servo motors that points in the direction of an object with a certain tag. 

Here's an Example: A camera is on the sideline of a gym, and the players are running around. One player has a portable GPS piece attached to him, and the camera should point in the player's direction in order to capture the player's movements along with his background. 

A few questions:
Would I use two different compasses in order to both record the direction and point the camera in this direction? Or would I use a GPS for the player and somehow convert the streaming data into compass direction(in which the camera will point)? 

In a way, what combination (Player-Camera) would I use (if I need a combination), a GPS-GPS, GPS-compass, or compass-compass?

Do I actually need two location devices or just one? 

Thanks,
Mark
Take a look at the uTube site of "iforce2d". Chris has a couple of GPS projects, which use a GPS and nRF24L01 transceivers to implement a "GPS tag" and he has a model car follow the tag. He also has a ground station with a pan and tilt and a camera following his quadcopter (drone). Lots of useful stuff there.