victorzamora
Contributor
Yes, but I don't think you can switch back to air from Nitrox mode. I'm not 100% sure about the Geo, but on many computers if you do a dive on EAN32 (for example) and then want to do an air dive you have to set it to EAN21. I don't understand the difference between "Air" and "EAN21" except for when divers aren't Nitrox certified and may not know the difference.You can switch from Air to Nitrox with the Geo.
MOD of air is 187ft.....I don't think it really helps much to show itI would still set to 21% anyways because then it shows MOD's.