Chief Delphi - Unique ways of controlling your robot (driving)

We didn't have too many practice sessions with the robot really. We also had to make an adjustment or two because of LACK of communication. Our robot has an arm to herd and a poker which pops up and pushes the ball off. Now, when we were practicing sometimes for some reason some how whoever was controlling the poker popped it up and instead of going under the rack and then popping it off, we rammed into it and we sent the plastic rack crashing down. Unfortunately, the rack or w/e you want to call it in the competition isn't made of plastic.

In the practice matches the day before our regional competition we did exactly that. We rammed into the rack with our poker up. Because our robot has a very low center of gravity and because it ways 117 pounds, we didn't tip over. We crashed into it full force and for the entire practice match we were tipped diagnal and couldn't get the robot to move. This wasn't neccessarily bad, but other robots kept ramming into ours and by the end of the two minutes our robot's arm was bent and it completely jammed. We got a new arm easily enough, but we had to change the code so that you could not use the poker if we were driving.

I have a question which I hope is relevent enough to the thread topic.
Has anyone heard of a robot or would know if it's possible to get some sort of electronic compass onto the robot so it would know which way points north?