I'm pretty sure they changed the gas setting functionality on the teric. There is on, off and active. Planning and TTS will consider on and active gasses. Actual NDL or deco time will be based only on the selected gas though.
So it doesn't matter if you are diving and have both 21 and 31 set to on, so long as the gas you are diving is selected. Your TTS may be off, but for NDL, it'll be based on ascent rate anyway.
So it doesn't matter if you are diving and have both 21 and 31 set to on, so long as the gas you are diving is selected. Your TTS may be off, but for NDL, it'll be based on ascent rate anyway.