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I'll sell just the NERD if you're interested. Call it a thousand a shipped in US?

Works great, I just don't need multiple primaries anymore. Bought in 2020 new and only used in fresh water. These typically go for $2,800 new, looking for $1,800 plus shipping within US.

67 hours, fresh water only. Willing to ship in US (included in price). I had a hard time figuring out exactly how to price this, as they don't pop up a ton, but they're about $2k new and it's never seen salt and well taken care of, so I think it's fair, but I'm happy to discuss price if I'm way...

Selling my JJ because I can't use it enough to stay proficient and my situation likely isn't changing for several years. It's configured GUE style with a carbon fiber plate, halcyon wing, H75 Dil and bailout regs, H50 O2 reg, and an added NERD 2. 258 hours on the unit, mostly fresh water...

There aren't a ton of routine reasons to offboard dil on CCR. It's mostly done in response to some kind of equipment failure, though I'm sure there are edge cases in more complex dives where it makes sense. The way the article is written, it implies that dil was either too hot or O2 was...

That's exactly it. I had one due to an improperly sized neck seal paired with a bit too much exertion 30 minutes into a cave at 160'. And that was on OC. It's very much possible. It was a slow build. Feeling a little more narced than I felt like I should have on 18/45 initially. Then I was...

They should be teaching you to make informed decisions when their exact way of doing things doesn't work in a certain situation. If you're gonna disregard most of what they say, yeah, no reason to be learning from them. But a good instructor will talk out a disagreement, weigh in, and give you...

I use both. In open water, being able to park my right hand on the O2 MAV and left hand on the dump and do the entire zero visual reference ascent using the NERD for PO2, ascent rate, stops, and deco is incredible. In a cave, that advantage is negated and I like the simplicity of the HUD. At...

It's situational. Not normally though. The usual answer is dive more conservatively than thirds if you're worried about it being too aggressive. I will drop a safety on the exit side of particularly nasty restrictions or difficult sections of cave if I feel like it might be necessary or if it...

This is one of the reasons UTD is still fairly fringe. Ratio deco is very much a ballpark guess best suited for the backup to your backup plan. GUE still teaches a version of it, but it's secondary to tables (and realistically, tertiary with the general acceptance of computers across the...

You can push a button on your left T piece to fire the ADV while holding the cl dump open with your right hand. Works the same for dewatering. If you can jack the 50s up to 3600, it's fine for 250-300ft open water dives without another bottom gas cylinder. That assumes proper deco gas...

It's really not bad. Say I'm 1000ft from the door at 110' and want to figure out a new usable gas volume to set turn pressure for a detour. 1000ft is about 30min swimming, conservatively. Assuming I'm sharing, I'll double my stressed rate of .75 to get 1.5 cubic ft/min. I know it's about .3ATA...

It's basically a standard doubles rig attached to a breather. Rationale being that you fall back on what you're familiar with in an emergency. For GUE, that's doubles. So if you bailout, you're bailing out to a configuration you know very well. Stages are easy, it's a CCR, so they're all floaty...

It's definitely more complicated, but it's like being fluent in a slightly illogical language (like English). It's just how your brain thinks. I can work in metric, but I end up converting it to units I'm familiar with to contextualize it. Which totally defeats the purpose. So while there are a...

d) bailout early I've been significantly CO2'd on OC before (overexertion, bad technique, and a poorly fitted neck seal) and it's terrifying. Since then, I've come close to doing it again, but I've started recognizing the symptoms. The first one I notice is a feeling of impending doom that I...

I did all my cave training in FL. You're going to be very limited at the C1/Intro/Apprentice level thanks to the depth. That said, FL caves are hard work and it's great experience. MX is going to be far more complicated from a navigational perspective, but that won't matter as much at the...

20/85 is still used in classes. In my experience with GUE classes involving deco (C2, T1, CCR1, CCR Cave), time was spent discussing the current state of deco research and how different GF values can be adjusted to fit the dive or the individual. InDepth has also run articles that address the...

Yes, you're limited by bailout, but only if you need to bailout. Take a dive to a bit below 200', for example. You're racking up deco at a 2:1 ratio. On OC, a significant delay for entanglement or getting lost inside a wreck or a cave could be fatal. You could run out of bottom gas, rack up...

I'm not disagreeing with you that ccr requires a lot more attention and active focus. I just disagree that using the number of ccr accidents compared to accidents that can be definitively pinned on narcosis is a flawed assumption.

Cave diver drunk is also accurate.