On Wednesday, July 6, 2016 at 12:20:19 PM UTC-5, wrote:
Ignoring airspace and start/finish gate implications, which is better for managing final glides: GPS or pressure altitude?

I guess the question is how the glide computer figures final glides? If it is purely geometric altitude divided by the glide angle that matches the Mc you set in (adjusted for wind, wingloading, etc), then theoretically, pure GPS elevation (not altitude) should be more accurate - since it is not affected by pressure or temperature differences, and the GPS error is usually pretty small.

I'm guessing that GPS is better...

Kirk