Tech or rebreatherr?

[Doppler]

Oooops, when did it change?

When TDI restructured its CCR curriculum... a two or three years ago?

Air-diluent - 30 metres "no deco"
Air-diluent - 45 metres full deco
Mixed-gas-diluent - 60 metres
Advanced mix - 100 metres.

The first level does not required Advanced Nitrox since the course outline includes everything covered in the traditional stand-alone Ad-Nitrox course.

 

[p1p]

or go IANTD, and its 3 levels instead of 4.

 

[Mustard Dave]

or go IANTD, and its 3 levels instead of 4.

Both are similar. Before you can do IANTD Mod 1, you need AN & DP or ART. IANTD Mod 1 can be done with an air diluent or trimix with a minimum 21% O2.

With TDI, Mod 1 requires only basic nitrox and 20 logged OC dives. You are limited to 30m with no deco. If you hold an AN & DP cert on OC, you can jump straight to Mod 2.

[TABLE="class: grid, width: 500"]
[TR]
[TD]TDI
[/TD]
[TD]Limit
[/TD]
[TD]IANTD
[/TD]
[TD]Limit
[/TD]
[/TR]
[TR]
[TD]Mod 1
[/TD]
[TD]30m Air (no deco)
[/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD]Mod 2
[/TD]
[TD]45m Air
[/TD]
[TD]Mod 1
[/TD]
[TD]48m Trimix / 42m Air
(15 min deco max)
[/TD]
[/TR]
[TR]
[TD]Mod 3
[/TD]
[TD]60m Normoxic Trimix
[/TD]
[TD]Mod 2
[/TD]
[TD]60m Normoxic trimix
[/TD]
[/TR]
[TR]
[TD]Mod 4
[/TD]
[TD]100m Hypoxic Trimix
[/TD]
[TD]Mod 3
[/TD]
[TD]100m Hypoxic Trimix
[/TD]
[/TR]
[/TABLE]