TDI Deco Gas Reserve

[Chris Thomas]

Too true!

[Mark Chase]

Yeah, really, if you have deco procedures and advanced nitrox, you should really do 'Mod 1' on trimix to 45m.

21/35 doesn't significantly change deco requirements, I don't see why it's not included in all Mod 1's.

Totaly agree. Forcing divers to do a load of 30m+ diving prior to being allowed mix is just insain in UK conditions.

I dive trimix from Day 1 after the Mod1 course.

ATB

Mark

[steve6690]

Totaly agree. Forcing divers to do a load of 30m+ diving prior to being allowed mix is just insain in UK conditions.

I dive trimix from Day 1 after the Mod1 course.

ATB

Mark

I agree. I think a new thread is in order. Stand by. ..

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[Chris Thomas]

I agree. I think a new thread is in order. Stand by. ..

Sent from my GT-I9300 using Tapatalk 2

What's wrong with this thread? It's TDF, it doesn't have to be on topic.

I'll be diving helium where I can when I do a Mod 1. I'll not be below my certified depth until I have the experience, but I will be building my experience up with a clear head.

[Chris Thomas]

What's wrong with this thread? It's TDF, it doesn't have to be on topic.

I'll be diving trimix where I can when I do a Mod 1. I'll not be below my certified depth until I have the experience, but I will be building my experience up with a clear head.

[JPTaylor]

I'll be diving helium where I can when I do a Mod 1. I'll not be below my certified depth until I have the experience, but I will be building my experience up with a clear head.

One issue is buoyancy control, rapid uncontrolled ascents are maybe better done on Air rather than Helium mixes?

I did about 20hrs before I used a weak mix (16/24), I'd sorted out my weight (dropped a lot of lead post course) & practiced simulated deco stop dives making sure I could easily hold 12/9/6m stops and also stop/hold a 3m stop in the sea.

I went down the HeliAir route, using 16/24, 15/29 (still a favorite), 12/42 & 10/52 before I got around to doing a Mod 2 (PSAI 70m ticket)

[Chris Thomas]

Totally agree with that approach. I'm not looking to push my luck and will be taking it steady until I'm comfortable with the unit and my buoyancy.

[JPTaylor]

Totally agree with that approach. I'm not looking to push my luck and will be taking it steady until I'm comfortable with the unit and my buoyancy.

I still find 30-35m 'ish dives with just a brief deco stop at 6m, trickier than deeper dives where first stop maybe 21m or deeper.

Why? Temptation is to come barreling up to 6m with set-point & loop volume all over the place, then buoyancy at 6m goes to rat shit! On deeper dives you sort this stuff out by default on deeper stops.

Still practice what I was told on my Mod 1, always stop at 12m even if deco stop shallower, to sort out loop volume & let SP stabilize before ascending to 9/6m stops.

[Big Matt]

at the risk of opening a can of worms i have a question. actually it's more like a request for advice really.

currently BSAC DL/OWI, with ADP, and want to move onto trimix to allow progression onto some deeper stuff i.e 40-50m. not interested in going any deeper than that. i'm after a course that will teach this but also certify me for primary donate so i can fulfill my duty of care with BSAC. have been taught it but no formal certification. don't want to start a debate about the hog looping thing all over again, it is what it is, just after peoples opinions on TDI, IANTD etc. and which course might be best suit my needs.

opinions?

[Mark Powell]

Yeah, really, if you have deco procedures and advanced nitrox, you should really do 'Mod 1' on trimix to 45m.

21/35 doesn't significantly change deco requirements, I don't see why it's not included in all Mod 1's.

Are you suggesting something like Helitrox on Mod 1?