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Hi All, Does anyone have a model, or the thread specification for an Apeks Drysuit valve? Thanks John

I'm a bit biased,,,,,,, :) But also happy to answer any direct questions you have if you want to DM me. Thanks John

There's really only 2 war wrecks divable by recreational divers, X127 and HMS Maori. All the other interesting war wrecks are 50m+ deep. Divewise/Techwise are very good. Hth John

Think that's a 4.5ah explorer with a 10w HID head.

Lots of good stuff being said, I'm going to add some more. Are you likely to go to France again anytime soon? If so, use a reel on every dive. Lay an entire primary reel as you go into each cave. Yes, it'll take some time out of your dive, but it's the best way to practice. And by every dive, I...

Feel free to shoot me a PM of you want to talk through the GUE pathway. Whereabouts in the world are you based? (You've mentioned Italy and Croatia) Thanks John (GUE CCR instructor ;) )

I could give loads of suggestions, however none for less that $2k ;) Any camera can be used for photogrammetry, but as with everything it all depends. For me the camera is a lot less important than the lighting. You need a lot of light for photogrammetry. Depending which rig I'm using, my...

Absolutely no problems with taking Fundamentals as a new OW diver. I've had many students who are in that kind of bracket. You won't necessarily pass straight off the bat on a 4 day class, but diving skill, comfort and confidence will all improve and give a great foundation to build future...

Correct choice of drysuit undergarments will mean that even a fully flooded suit will maintain some amount of bouyancy. This is one of the reasons that for larger dives we often prefer to use thinsulate based undergarments rather than fleece. Hth John

There is no standard for this. We intentionally have no standard to avoid people using position as part of their gas switching procedure. In terms of only 2 bottles it really makes very little difference. HTH John

Exactly this. A Rec pass is a pass, there is no time limit, nor obligation to upgrade. If you want to upgrade, then that can happen whenever. Have you done any diving in doubles? If not, then stick to single tank for now. Doubles are heavy, they have more momentum, so require much better skills...

This. Take fundies. Then go diving with the GUE community. Stop rushing towards some certification goal, and enjoy the skills that you will gain from fundies. And stop trying to pretrain for fundies - No really, stop it. It won't help you, and may well hinder you.

Here is my advice. Take fundies now, or at least as soon as possible. Stop trying to prepare for fundies, and just take the class. Don't worry about T1, when you're ready, you'll be ready. The 100 dives is an absolute minimum. Make sure you are in a position to be able to do a decent number of...

From an instructional point of view, Fundamentals is definitely the hardest course that I teach. The concept behind fundamentals is to start the process of getting divers to dive within the GUE standards. Students can come in with vast ranges of capability or experience, and the challenge is to...

Not a required skill, not sure it's ever been a required skill. Certainly wasn't when I took T1 in 2004, and hasn't been at any point I've been a T1 instructor. Thanks John

That's not true. It effects the long hose. It effects your width, it potentially has worrying work of breathing (any side mount rebreather is going to be twitchy about position for work of breathing etc etc I'm not saying that any of these are not manageable, but they are considerations that...

The vast majority of diving is big enough for a backmounted configuration. Anywhere that isn't big enough isn't going to work with a set of doubles on your back anyway, so no benefit there. We didn't just pluck the JJ out of thin air, it was decided upon after several years of testing of every...

Most of the people replying to these kind of questions have never trained as a GUE CCR diver. The GUE rigged JJ is comfortable to dive, the larger backgas cylinders mean you have instant access to a lot of bailout gas very quickly, without resorting to dangerous or complex fast stage switches...

I'd be happy to have a chat offline. Drop me an email John "at" GUE "dot" com I can't say yes, or no to whether you could take GUE training, but I'm happy to have a chat about specifics, and see what can be arranged. Thanks John

The limit is 170ft (51m) and I certainly try to get my students to 170ft on any tech 1 class I run (dictated by weather, boat availability and logistics) Thanks John