Jay
Need to dive more!
Please see Post 47 for a summary.
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This caught me out(*) re what MOD the Teric was using. It might catch out some divers like me who don't dive Deco and/or ignored the OC Deco PPO2 setting, and thought that switching to/from Air --> Nitrox was correctly done via the quicker Select Gas menu option.
Short version; after entering a new gas, say Nitrox 32%, if you switch gases from Air to Nitrox via the (easier/quicker) Select Gas (Select Gas header) menu item, you'll be using OC Deco PPO2 (default of 1.6) for your Nitrox MOD calc. If you select Nitrox via the Settings / Gases (Edit Gases header), you'll be using OC MOD PPO2 (default 1.40) for your Nitrox MOD calc.
FWIW, either method of switching from Nitrox to Air will use OC MOD PPO2.
Here's why: The Select Gas menu leaves Air turn on. The Settings / Gases route, forces you to turn off Air. And to quote SW: "You should only have gasses you are carrying and plan to use on the current dive turned on. Only one of these gasses are usually used on the working (bottom) part of the dive, the leanest mix. So that mix will use MOD PPO2 while all other mixes are assumed to be decompression gasses that will use the Deco PPO2 limit."
* Please don't think I didn't know and dive my MOD pre-dive, just that I haven't used that as a display option on the Teric / noticed it on the Info menus.
• I've read the manual (Rec parts) ... perhaps I missed something but IMO p.27 (5.1) doesn't quite spell it out like it has been above (re MOD implications).
• I'm aware from a Tec diver's perspective whose familiar with correct gas switching etc this might seem a rookie error, and I would have typed this in the Basic forum ... but please avoid any flames as this post is to ensure other Rec divers don't err as well.
•[EDIT to add] IDK re how the Perdix works in this regard.