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misread, but alas there are no second changes

A tub, and the occasional roach bomb.

I have filled J valve tanks, never dived with them. Even my Dad has never dived J valves, he had the regulator that rattled with declining pressure. The Scubaboard demographics would tell a story. What if 5% actually knew the answer from experience? The other 18% thought back to their OW...

If the price is right, get it, and use the saved cash for the next bit of gear. Second hand gear is great too. You can service regs, put new bladders in wings, run a new length of webbing through a backplate. A lot of core tech gear is so absurdly similar that in a blind test I don't think you'd...

Have you got a diagram or something? The application is unique to my CANbus experience, happy to be educated.

That is a shame, but completely understandable. Many hobbies can have consequences and if its not paying the bills, discretion is often the better part of valour. Even as a dive professional it can fail to cover the bills. A point to consider is that as a qualified diver you now have complete...

I'd agree it is far more difficult, but it is still possible to find things by sound. The process can be quite slow and tedious as we've lost the instinctive ability to do it, but it can be done. Turn your head left and listen, turn it right and listen, turn your whole body 90° and listen...

You'll overinflate orally if you send it up from deep enough. It's built into the dump valve on all the closed SMBs I've seen.

Oral inflation is so 2005, install a second BCD hose on a spare LP port and power inflate it. I use my drysuit hose, which I leave on my regs when I'm diving wet and disconnect/reconnect when diving dry.

I'll speculate the 5th pin is a pilot connection. The main power, CAN power, CAN hi and CAN low, will be the essential four pins. To make it a wet connection, you need to know when its actually connected. A pilot connection is a common method used in high voltage systems, where all those pins...

I expect the true issue here is a 'sport diver' understanding of physiology and with basic equipment and skills. The question is a crude manner of giving an OW student a clear guide to not dive the NDL and expect to not get on the wrong side of the margin of error. Safe diving based on...

Looking at the guy's FB page, he's got a Spirit Lite. Compatibility is one thing, doing it as a trade is an extra challenge.

This is the only NERD 4pin I've seen. Andreas Klocker

It's physics, this inarguably happens, but it's measurement is relative. Dive physics and physiology that are immeasurable to the diver are quite relevant to our dive plan. For the purposes of an OW lesson, what is the piece of knowledge that needs to be retained? We inflate balloons with lung...

Assume a spherical pig, at standard temperature and pressure (if I recall). Whilst absolutely correct, the true reality is that the training material is made by senior diving instructors for a junior diving instructor to deliver to open water students. I will guarantee that whilst the student...

Everything after the first comma applies to basically every high-end regulator. You have to hunt for Apeks service kits, whereas Deep6 and DiveRite will sell them directly to you.

DM is a lot of work, but you'll learn a lot as well. Enjoy

I was on a boat with six of us diving doubles, apart from a set of Tec 3, everyone was running 5th port sidemount regs on a backmount. Two divers with DST and XTX50, a set of Hollis DCX with 500SE side exhaust, a set of Hollis DCX with 200LX, the Tec 3, and Scubaforce BlackDevil SM. I have dived...

Would it be more convenient? For all intents and purposes, ambient pressure is our zero (datum). It's key to what our TTS will be, surface off gassing rates, etc. Every pressure variation during the dive is relative to our zero. The absolute number ceases to be useful to the diver, even though...

It strikes me that there are clear reasons for this unusual requirement, and he supplies an easy workaround at likely cost price to him. And he's upfront about it, which is respectful. His odd requirements are directly linked to his unique course content and student outcomes. He's not forcing...