Quote:
| Originally Posted by IanDennis Morning Mark 
For the reduction in narcosis at 40m its ideal.
Best wishes
Ian |
If there were no GUE courses (and for most these aren't easily available) personally I think your tri-ox course is a WAY better option for UK diving than ADV. Nitrox and Deco, and would highly recommend it above that alternative.
Going through my TDI Instructor manual all I can find for deco gas requirements is "Cylinder volume appropriate for planned dive and student gas consumption". So TDI leave this to the instructor, do IANTD recommend your reserve amount?