Paul Bart wrote:
"Marc Ramsey" wrote in message
Yes, this is correct. You don't have to climb as high on a cold winter
day, as you would on a hot summer day, to obtain a specific pressure
altitude gain. But, I suspect some (maybe most?) would say that we have
always measured pressure altitude is this sport, and that we should
continue doing so...

Thanks for your reply. Given the budding status of my gliding career, this
is not likely to be an issue for me any time soon , however given that GPS
can *potentially* reduce an error, by up to 1000 ft it should be seriously
considered.

But, using GPS altitude only reduces the error if we were measuring
geometric altitude. Using GPS altitude under the present rules would
*increase* the error, because we are presently measuring pressure altitude.

I wonder if the resistance to change is mainly due to the high
average age of the gliding fraternity?

I'm not going to touch that one...

Marc