To add to Conrad's warning about GPS -throw a spare set of fresh batteries in pack, even if the ones in the unit are new. Before you leave your vehicle, take a GPS fix and WRITE DOWN the coords. If you have to do a reset or battery change, its nice to know where you are returning to. And take a compass too. One of the nice things about taking a GPS along, is being able to mark spots you might not get to get set up on, or think you might want to return to in different light.
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