What’s All This Solo Hiking Stuff, Anyhow?
Bob Pease
June 16, 2011
... Bring water. Bring water purifying pills. A little food. Enough warm clothes (and a sleeping bag in winter). Bring a whistle. And, bring a watch.
Now, why would you want to bring a watch and spoil the unplanned, un-organized fun of a spontaneous hike? One serious reason: So you know when to turn around! You need to plan when to turn around and not fudge this time very much.
http://electronicdesign.com/article/analog-and-mixed-signal/What-s-All-This-Solo-Hiking-Stuff-Anyhow-.aspx