Please, Please, Please take the time to read this link. It was reading this story when it happened that burnt into my mind the need for a sat phone or personal locator beacon. A slip or fall can happen in a blink of an eye, I know this first hand as we had to have a member of our group flew out by coast guard helicopter after breaking a leg during a fall while goat hunting.
Could you imagine being a father and having to leave your son on the mountain while you walk out for help??? This story reinforced the need for both a means to get help but also the need to have basic survival items with you at all times.
http://fp1.centurytel.net/170/father_let_go.htm
I got all teared up reading this. I can't imagine what he went through.