Its hard to follow up a recommendation by Doug :-) , but if it means anything ... +1 on what Doug said.

I purchased a PLB a while back, have never used it, but it offers a nice level of comfort knowing that my family and I can get help if needed. Its a really REALLY cheap insurance policy that takes advantage of some amazing technology ... if you want to think of it that way.

Still, I continue to plan to carry what I (or we) need to be as "findable" as possible - night or day, and to be prepared to wait out the time until rescue comes (figuring a day or two ... or three uncomfortably).