Note: this post is from 2007, outbound links may be broken.
How to use a wristwatch as a compass
Wired How To’s shows you how to use a wristwatch as a compass.
From the wiki entry:
Hold a watch with 12 o’clock at left.
Move your arm so the hour hand points at the sun.
The spot halfway between the hour hand and the 12 is south.
Good tip for when your GPS device is out of batteries!
Make user tramm_hudson lists a few caveats:
- Doesn’t work with 24-hour analog dials
- Doesn’t work in the Southern Hemisphere
- Doesn’t work at night
- Works best around noon
- Varies slightly depending on time of sunset/sunrise
- Need to add an hour with daylight savings time
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