1) "Flight Plan". Written schedule of places I'll be, and when, left with someone (or someones for the truly prepared), contact information for each location, my personal information (name, description, recent picture, etc). Everything someone would need to figure out where I should be at a given time. If the schedule changes, I'll amend the flight plan so that it's always current.

2) Other equipment as required for my trip. And cash. Always cash. <img src="/images/graemlins/smile.gif" alt="" />

If you plan a trip, and stick to the plan, someone will come looking for you before deep survival becomes necessary. At least, that's the message I've picked up from this board over the years. Sounds like a good idea to me.

(Don't mean to kill the thread... It's just that no one has mentioned the one thing that might actually measurably increase your chance of survival in ANY environment.)