Banning GPS in the wilderness? Only reason I could see would include banning all electronic devices
I think PtMcG's tongue was firmly in cheek for this one. But all electronic devices? That would be something, no digital cameras or even film models with any electronics...hope you kept that old Brownie and some flashbulbs 8^). No cell phones of course, no more worry about using ipods etc., or walkie-talkies, and no watches unless it's an old windup one. Be sure to leave your car's remote or key behind, and of course, no pacemakers...8^)
Back to the water filter for Steri-pen users, and those electric socks...well, they'd better have just an off-on switch.