Thanks Steve for your reply.
I finally went to some shops and looked at the
Suunto and Casio watches and decided that both were out of my price range. The
Suunto here in Australia start at around $700 up to $1,600 for their
GPS watch. The Casio was from $430 on special up to about $560 plus no PC link.
I eventually went with an Oregon Scientific which had Altitude, Barometer, Heart Rate and PC linkage for $200 plus $60 for the PC linkage module. I could have bought one without the Heart Rate for $150 but I did not like the look of it. So for $260 I have a watch with the same features as the
Suunto and the important PC linkage which the Casio did not have.
So if the altimeter is not very successful with my flying I can sort of write off $260 where $700-$1,600 is way too much for a time keeping trinket.
I have not had a chance yet to fly with the watch but it appears to be quite accurate once it is calibrated to sea level barometric pressure or altitude of a known place.