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Musher's in this year's race are carrying 2 GPS devices, each attached facing skyward on the top of the sleds. The primary device is a SPOT tracker, which also features "help" and "911" buttons in the event a musher really finds himself or herself in trouble. Anyone hitting one of those buttons, though, had better mean it... while each situation would be reviewed for exceptions, activating one of those typically leads to disqualification for the team. The second device transmits more limited data, but it is a very hardy gadget that serves as a back-up to the primary SPOT tracker.
Picture: Anna chats with a race volunteer as he attaches her GPS devices. About the size of a large dog paw, the devices are enclosed in color-coded bags that look much like dog booties and are held in place by industrial safety pins.