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How to set specific po2 for deco gas ?


Very simple question :

In multiple gas dive, how to set : 

  • 1.4 po2 for air
  • 1.6 po2 for deco gas

There is three possible values in the parameters: 

  • MOD/deco po2 : I guess I should enter 1.4. It's before the ascend 
  • Warning po2 threshold: I enter 1.6 ?
  • Critical po2 threshold : 1.6 too ?

Or maybe garmin is just not made for tec dives.

Thank you.