For Sale:

Themi thermal centering/IGC approved GPS/Data Logger. Used about 100 hr in
2 years

Yes, it really works. I don't have a good place for it in the DG panel.
Space behind the panel is quite limited.

Can be set up to drive a PDA and software via special cabling

Cost new--1300 USD make offer.
--
Hartley Falbaum

DG 800B "KF" USA