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From memory, you'd have to complete the OWSI portion of the PADI Instructor Development Course, plus a few additional academic modules because you are a crossover candidate, and then sit the PADI IE. For a seven day IDC, the OWSI portion normally lasts four days. So from a purely financial...

Personally, I disagree. In my experience, it is very rare that it is hard to identify which side of a manifold has failed - it's a simple case of listen, feel and look. Having had multiple airgunned (simulated) failures ranging from tiny bubbles to torrents of gas, I'd say that about 95% of...

You'll get lots of opinions on this, for sure.... The main advantage of inverting tanks is that two valves become easier to reach, I remain unconvinced about the isolator myself - so you may need a slob knob for that. Many people will tell you "it's an equipment solution to a technique...

Realistically, unless the diver is inside a wreck or somesuch, the fact that the diver has donated gas means that they are going straight to the surface. If you go into a position that is heads up, you don't need to remove the Air2 from your mouth to release air from the BCD. Literally...

I remember a couple of years ago, I had to do a drysuit orientation for a diver prior to them doing a drysuit course later in the week. Typically, student turns up with the rental drysuit form the LDS and their fins didn't fit the boots. I ended up doing the entire session with no fins, as I...

I've tended to use RMV as a volumetric term (litres per minute) and SAC as a pressure term (bar per minute). We've just gone through all our teaching materials and found a mix of RMV, SAC and SCR used in different places in different ways. Looking to standardise on a single term, so curious...

A simple poll. What term do you use to describe the amount of gas consumed per minute at the surface, and what do you measure that in?

That's not a bad idea. It seems that the "rec pass" has become the new "provisional pass" anyway. It all gets a bit confusing.

Agreed. I would pop in the backup reg, then feel for the long hose running across my chest, the run my hand along that to locate the second stage. If the hose isn't there, I'd reach down to the can light and find the hose at that point. Because you've got your backup in, there's no rush to...

Totally agree with Thal, defaulting to 50% makes no sense whatsoever. Poor design. What if someone only does a 18m dive without realising the change? They won't get any alarms, but will be getting erroneous deco information.

Look on the bright side, at least no one suggested a 13 cu ft......! You can do the maths yourself - pick the deepest depth you are ever going to dive, pick what you think would be a safe ascent rate and decide on how stressed you are likely to be. An example: Max depth = 40m (130ft)...

You'll get out of it what you put in to it. I wouldn't rush in to it, go do some diving and decide what kind of diving you like. Then pick your elective dives in the course to suit your aspirations. Shop around and find an instructor that is passionate about those types of dives, who will let...

Good on you, hope you find a Cavern instructor that holds up the reputation!! :)

I'm not making any value judgement - either positive or negative, but some people are working there way towards getting the PADI Master Scuba Diver rating. The NACD course wouldn't count, the PADI one would. If MSD something they feel has value, even if that value is the sense of achievement...

I think it's probably the same manual as you have, Peter - details are on the bottom left of the front page. Product No. 70221 (Rev. 5/05) Version 1.05 Many of the specialty instructor manuals are out of date, they aren't revised in the same way as the main DIM when standards changes...

No problem. Here is a smattering of interesting points from the instructor manual. Seems fairly reasonable, love the "including, but not limited to" which means you can include lots more if it's appropriate for the students and their aspirations. My manual actually also says "no out of...

B Lo - I'm not sure if you are finding this thread much use any more? If you do need specific questions regarding the requirements for the PADI Cavern course, please feel free to send me a PM. Whilst I am not a Cavern instructor, my two business partners are. I also have a copy of the...

as an instructor, how would you measure "control" over position - in objective, quantifiable way? To my mind, you need a fixed reference to measure variation away from. I guess that people fixate on the measure, rather than what the measure is doing? Yeah, I love diving in a single tank...

You have to remember what the Cavern diver course is - it's an introduction to diving in the overhead environment, with no restrictions and always with in the light zone. You need three light sources, because you always have visual reference to the outside that means you need to carry two...

I find this interesting, John, because we talked about trim a lot on my Fundies class. Though it didn't come up on T1. The discussion during Fundies basically revolved around my suggestion that it doesn't matter a rats ar$e or not whether you are in or out of trim - provided you know that you...