Don't forget the compass and/or GPS. And some alternative way to communicate with rescuers or potential rescuers (Amateur "Ham" radio, FRS radio, GMRS radio, satellite phone, etc.).

Even if you're not a licensed amateur radio operator (which is relatively easy to get), the radios are cheap enough to obtain and would be great in an emergency. The FCC gets pretty relaxed about using radios when someone's life is at stake. Check out www.arrl.org for more info.

The area where the Kim family was stuck has horrible cell phone reception. There just aren't any folks living out there to warrant putting up expensive cell towers. Having a secondary means to communicate is almost a necessity.