I know you're joking, but one tip my Nitrox instructor gave me for using a one-button computer is to always leave it on the Nitrox setting but set it to 21% when diving air to have one less menu to navigate when switching.
Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
Simple: when you fill your tanks, you fill them with EAN21.
I know you're joking, but one tip my Nitrox instructor gave me for using a one-button computer is to always leave it on the Nitrox setting but set it to 21% when diving air to have one less menu to navigate when switching.
Who are you telling this to?