DCDW

Hi all! I have been reading about Dirt Cheap Dumb Wireless but cant seem to find the communication range of such a device. Perhaps DCDW isn't even the right choice for my project. I am trying to have an arduino with positioning capabilities of at least a square mile +/- 3 feet. With tolerances so tight, GPS would probably be the only solution since RSSI and TOF can't do the job affordably (if I am wrong please correct me!). I also need the unit to report its position back to a PC at regular intervals. Any insight is greatly appreciated!!!