Garmin Rino 530
It's one thing to have a waterproof GPS with a killer interface, great maps, and a color screen, but add a 5-watt radio to the mix and you have just saved significant weight, space, and hassle. The 530's two-way radio has a range of up to 14 miles (unrestricted line of sight), and it will interface with any VHS handheld radio.
Besides giving you the ability to figure out your location and call someone to help drag your buck back to camp, the 530 is jammed with practical tools, including an NOAA regional weather radio and instant sunrise and sunset info. There is also a hunt-and-fish moon-phase table that calibrates to your exact location. You can even check the moon for the next five deer seasons (very entertaining when you're trying to stay awake on a tree stand). The power system is a rechargeable lithium-ion battery that will last 14 hours; you can add an alkaline battery adapter. $535; 800-800-1020; garmin.com --P.B.M.