Wristwatch collectors out there?

[markem]

Originally Posted by mosesbotbol

If you set the altimeter, you can calculate current elevation or feet climbed within a timeframe.

If you are just doing a bike ride or similar day activity, you don't need to set it. Just note the start "elevation" and all the other waypoints. The errors will cancel. If, however, you want to measure vs something like a topographic map, you need to set so that you have reasonable confidence in your mapping to the set reference that is the map.