"es330td" wrote in message
...
I am trying to figure
out how useful this feature would be if it can't be adjusted for local
conditions.

I have worn one for several years now, but the altimeter has only
limited usefulness. The first thing I noticed is that the altimeter does
not read continuously. Probably to save battery life, it only updates
occasionally. With several button pushes, you can "interrogate" it at will,
but that is not much help when you are busy in (say) a landing pattern.

The other problem, (as you have already guessed) is calibration. There is
no way to set mine according to atmospheric pressure. Instead, you
calibrate the reading to the "proper" altitude in exactly the same manner as
you set your watch to the proper time. This is OK for local flights because
I can just set if for field elevation before I take off, but not so useful
for X-country flying.

Vaughn