GoatRider, the TSA can declare any item, even one on their list of approved items, to be contraband and
simply confiscated it. Lots of stories of this happening.

As suggested in another thread, you oughta consider FedExing the GPS and anything else of value to
your destination, and FedExing it back home before you leave. It's the only way to be sure that it
arrives and you're not hassled because you have it.