LOL!

Correct me if I'm wrong, but anything that could climb at 60,000 per minute
would probably be powered by a big-ass rocket engine and piloted by someone
named Yeager, Crossfield, Glenn, etc... Excepting of course for Burt Rutan's
ship.

All of us poor-boy hang-glider pilots use electronic variometers. Most of
these are acurate to the foot (or fractions thereof) and have an audible tone
that changes to indicate climb or sink.

Harry Frey
USHGA #79944
Hang 1 and climbing