A small GPS in the bag can be a godsend, especially if you have a spot on the glareshield reserved for it where the antenna can "see" the satellites through the windshield. Just be sure to review your unit's functions every so often so the Direct-to and Nearest-airport functions, at least, are fresh in your mind. It's also a good idea to tape a note to the unit, itself, with a brief reminder of how to make it work (Do the same with the handheld radio). An emergency is no time to be thumbing through the manual. Today's battery-powered handhelds have some remarkable capability, but all that can be wasted if you've forgotten which buttons to push to access the magic.