Betty, do you have the manual on the Gekko? It's my memory that my Suunto manuals had extensive sections showing the various screen displays under different circumstances. That way, you would have a chance to familiarize yourself with the display without having to figure out how to get the computer to show it.
Another real easy way to put your computer into deco is to do a dive on 32% and not tell the computer you're on Nitrox. The computer will show you in deco long before you actually have an obligation.
Another real easy way to put your computer into deco is to do a dive on 32% and not tell the computer you're on Nitrox. The computer will show you in deco long before you actually have an obligation.