Yes, but I sort of skipped over the SAC section. But I see that it mentions that it is a 2 minute average, which should be good enough. Now if they provide a GTR outside of OC Rec I would be happy as a clam. About the only features I would want then would be a GPS.
I don't have mine here to double-check, but I am 99% sure I can have mine display GTR even in OC Tec mode. The problem is that it stops displaying a number as soon as you exceed your NDL and go into deco. That is just a cheap cop-out.