Hi, I am currently looking to start MOD 1 and I would very much welcome advice from those with experience of agency variations of OC trimix qualification in the CCR world. It seem to be quite wide; from what I understand TDI takes no account of it with 50 hours on the unit(TDI Middle East) before MOD 2, whereas IANTD will allow OC Tmx divers to combine MOD1 and 2 with Normoxic Tmx qualification granted after 20 dives/25 hours. ANDI I couldn't understand even having looked at their website twice so non the wiser on that. It sounds to me like IANTD have the edge in agency one upmanship here in terms of time/cost, but would welcome advice from anyone who has adopted either of these approaches as to their effectiveness and value? (instructor notwithstanding of course) many thanks 