Borgelt Dynamis variometer
This things is still an interesting puzzle. No manuals or prices on the web site yet.
If TE = mgh + 1/2mv**2, perhaps one could measure v and/or h with a really good GPS instead of plumbing? (That might measure things with respect to the ground instead of airmass, but given that's where the next waypoint is, I'm still unconvinced that that is bad.)
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