Baldy

I got the GPS two years ago as a gift and used it only for hunting in Colorado to mark vehicles and animals. I haven't used it since. I just remembered I had it and decided to try my hand at this game. It's been sitting in a drawer for almost two years. Get it?

I already have a GPS and I've used it a few times. I just want to learn how to use it in this fashion.

Can someone please help me to learn this game? I want to play but I don't know where to start. I live in Rogers Park, Chicago. Thank you all!!