On Sat, 17 Nov 2007 14:46:31 +0000 (UTC), Bertie the Bunyip
wrote:

There's such a thing as an altimeter watch?

Useful for serious hikers. The altitude can help locate your
position on a topo map.

My little handheld Garmin 60cs GPS has a barometric altimeter and
magnetic compass to supplement the GPS position.