The first quoted sentence above was what I was looking for. IE, what specific things might an experienced diver consider "enough experience to be a DM candidate". I have done all of those (except drysuit diving) in less than 20 dives, hence my query about what specific experience someone might be required to have that they "couldn't get in 50 dives". (I think that was actually someone else who said that, not you.) I haven't done anything deeper than 75-80 feet, yet, but I can guarantee I will before I reach 50 dives. Sure, I recognize that I've had easy dives where things usually went well, but I've also had free-flows (minor ones nothing dramatic), blown o-rings, a BC that failed mid-dive, and several other "issues".
I just don't see how someone can arbitrarily say X number of dives isn't enough but Y is enough, I guess.
The last quoted sentence just about covers the opposite point as well. When qualified, a DM should be proficient enough to deal with common and uncommon problems in almost all types of diving. Many of us, myself included, think that in your 20 dives you can have seen a few different types of dive but never mastered them.
As an example, It takes far more than doing a few drift dives to be competent enough for taking responsibility for other. After 4 or 5 drift dives you can never have seen a variety of currents, or have seen conditions where it is better to call the dive rather than struggle. Neither will you have much experience in dealing with your, or others problems, dealing with these can be significantly more dificult in a current. You won't have any experience choosing where to drop divers in the water to do the dive either.
Similarly, for dives like drift dives it is really good to have seen how a number of different operators do things in their local conditions, as this eventually gives you a larger toolbox of techniques and ideas.
Now, multiply this by a number of specialities, deep, navigation, EANx, boat, photo, etc.. And you see that the number of dives necessary starts to add up.
It has to be understood that experience and proficiency are two separate entities....one testifies to the fact that you have done it X number of times. The second is how
well you are
consistently doing it according to the published standards. So it has to be observed more than once, against measurable performance criterias that you must repeatedly meet or exceed. For example, getting lost every second dive only demonstrates that you are
consistent in getting lost every second dive and in no way represent the
minimum consistency in proficiency that is sought in navigation.
This a a very good explication. PADI at O/W is the epitome of "proficiency". The student has to show proficiency before the Instructor should sign off a skill. Then they change at DM level and again at MSDT and above. The DM requires an arbitrary 50 dives minimum. There is no proficiency in the different domains required, just experience. The 50 dive minimum puts no minimum on the proficiency attained during these dives. It is strangely the same for OWSI to MSDT, and then to Staff or CD.
I would contrast this with CMAS. To get to a dive leader, or whatever they call in, then there is no number of dives, but a number of proficiencies that have to be obtained. Ifyou can get these in 4 or 5 dives, then great, but, if you don't, then you continue diving gaining experience until you are ready for an instructor to evaluate your proficiency.
An example in the crossover PADI rescue to CMAS. You need rescue, deep, and EFR. Then, you have to do a recommended minimum of 8 dives in the 40m zone. These dives have a number of proficiencies, and if you are proficient at this depth, you can do these in 2 dives and be signed off. If you have almost no experience, and are not particularly proficient, it may take 10 or 12 dives to become proficient, and have the instructor sign you off.
Personally, for the PADI DM, I would like to see similar proficiencies introduced instead of a minimum number of dives.
Jon