Am having difficulty finding components that can accurately determine distance between each other without having a GPS attached to both and just sending their location. Originally intended to do something with RSSI (received signal strength indication) and Xbees, but as it turns out that is an extremely inaccurate way of determining anything other than (there's either some amount of distance between these two objects or there's a bunch of objects in the way). On the scale I wanted to do this, this will not work.