On Feb 15, 10:08*am, Scott Alexander
wrote:
I have a netto variometer, 80mm, oldschool that shows +200fpm to
-200fpm in 10 ft increments.

How do I set that up to show what the air is doing and not what the
glider is doing?

Throw it away if it really has a range of +/- 200 fpm. It won't be of
any use on any day that's worth getting the glider out of the box.

Andy