Well the altimeter I'm using only scales in 5 feet intervals (good
enough for most things), but due to atmospheric changes day to day, it
can vary 500 feet in elevation on the same location. Unless I'm
religous about recalibrating, I wouldn't say it is accurate except for
elevation differences (i.e. I went up 2800 feet to cross over
Shenandoah Mountain, down 2500 on the other side, then back up 1500
feet to my place on the next ridge.

On May 18, 2005, at 12:28 AM, Jim Felder wrote:

> A decent aneroid altimeter should easily handle sub-contours on a topo
> (20 feet on the old stuff, 10 on the new). A good altimeter will show
> you the altitude in feet... accurately. My dad had one that would show
> you the distance between the desktop and the floor.