Teric & NDL obligation...

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I see the adjustment setting on my Teric now:

Settings>Deco>and scroll down to “Last Stop”. Choice is 10 or 20 feet.
 
If you set your computer to do deco at 10 feet then the deco time could/should be less, and therefore the TTS could/should be less. But for most divers - not tech divers - that difference in deco time and TTS may be 1 or 2 minutes. That difference would be a very small amount of additional air/gas consumption if you were doing the stop at 20 feet.
 
If you set your computer to do deco at 10 feet then the deco time could/should be less, and therefore the TTS could/should be less. But for most divers - not tech divers - that difference in deco time and TTS may be 1 or 2 minutes. That difference would be a very small amount of additional air/gas consumption if you were doing the stop at 20 feet.
If there are actual stops the 3m vs 6m thing can make a significant difference in time, especially on air. However, the main difference is that the computer will get annoyed if you are above the 6m final stop so your options are limited even if the water conditions would allow a shallower stop. You can’t tell the actual ceiling depth once you are above that last stop.

For a safety stop it doesn’t matter, there is no ceiling, just a period of time in the general vicinity. A safety stop is a fixed time, not a fixed ammount of off gassing, it takes the same time at 3m and 6m.

Btw, although I don’t generally get to do my final stop at 3m I always set the computer that way, I know the TTS will be a lie but other computers want divers doing stops between 3 and 6 and not being able to go to 5 is a pain.
 
Well a Shearwater will let you clear your deco at 5 even if you have the last stop set at 6. Some other computers will go into error mode.
 
Well a Shearwater will let you clear your deco at 5 even if you have the last stop set at 6. Some other computers will go into error mode.
Let’s say I just completed a stop at 9m, now I get to go to 6m, eventually I will be able to go to 3m. When can I go to 5m? Can I ignore the computer immediately? After 10 minutes?

Stops are stops. If the last stop is at 6 you do the deco at 6.
 
Stops are stops. If the last stop is at 6 you do the deco at 6.

Sure, but if your intention is to end your dive with a safety stop at 5+-1, after mandatory deco, it is logical to plan your deco stop below that.
 

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