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not an instructor either, but also a remark: Speed of movement should be fast when pushing the water backwards, but slow when retracting the ankles forward. During the kick phase, your ankles should move backwards only. There may be a short gliding phase before pulling the ankles forward slowly...

According to Wikipedia, "Efficiency is the (often measurable) ability to avoid wasting materials, energy, efforts, money, and time in doing something or in producing a desired result. In a more general sense, it is the ability to do things well, successfully, and without waste." "Without waste"...

The national regulations of CMAS member organizations seem to be quite different here. In German VDST, there is the 40m limit. No 60m air dives for CMAS*** here, you get certified for 40m (and that's the limit during training too). For deeper dives, take tec basic class, and Trimix*...

This example used this rule: compare the off-gassing gradient (p_tissue - p_inspired) at the current depth with the gradient at the ceiling, for every compartment and for every inert gas (N2 and He). If there's any compartment and inert gas that has less than 0.5bar off-gassing gradient at...

IIRC Mark Powell writes in Deco for Divers that the term "oxygen window" is used inconsistently in the community. The only actual effect of oxygen to speed up decompression is, that it reduces the amount of inert gases (N2, He) in the inspired gas. Whereas the other idea, that the pPO2...

ISS of three profiles

I don't agree with his method either and I don't suggest to use such a high GFlow only to avoid stops below 21m. But it's good to see that Andy thinks about the breathing gas in relation to the choice of GF, that's why I added the link. It's also a hint to adjust in the opposite direction: if...

If it's true, that's sad. I think such things happen more often but are not reported. We had a fatal OOG accident last year here in a lake and nobody understood how it could happen to an experienced tech diver with a lot of redundant gas on a relatively easy dive. A witness later told me, the...

I think you confuse cleaning with anti-fog treatment. There's nothing wrong with cleaning the mask. But a dirty mask doesn't necessarily fog more than a clean mask, and even a very clean mask will fog in cold water. My bathroom mirror is very clean, never had any silicon residue on it, and yet...

back to OP... Two things to consider: A) how quickly and reliably can I provide gas to a diver who is really OOG and needs it immediately? B) how easy and convenient is it to exit, go through restrictions, swim in current, hold on an ascent line, do a free ascent, ... Two very different...

I don't think one can decide well on a GF without considering the deco gas and gas switches. Two things are here in a trade off: a) want to go shallow fast to avoid further on-gassing b) want to stay deep to reduce over-saturation of tissues and DCS Item (b) depends only on depth and is...

Certain types of plastic are not resistant to freezing temperatures, become more brittle and are more likely to crack under pressure. Could be a reason for the recommendation to use metal housings when ice diving.

+1 regarding the wrecks. A day boat from Hurghada to the Thistlegorm for example takes 3 hours one way. Much better on a liveaboard, easy to do an early morning dive and have the wreck for yourself before the day boats come. If you prefer a week of reef diving then some hotels are good too.

Did your physician bring up the topic of a PFO? Severe undeserved type II DCS after an uneventful benign NDL dive could also be related to a PFO combined with exertion, coughing, sneezing, Valsalva maneuver, ...

two remarks: 1) oxtox risk correlates also with high ppCO2 in your blood. Rebreather divers with failed scrubbers are at risk also at ppO2 1.3bar or lower. Exertion is an issue, maybe also natural CO2 retainers and skip breathers. Hence the idea that 1.6 is OK for quiet deco but not for the...

1.44" diameter makes 1.6 sq in, which is 67% of the usable surface area of a Perdix, or 55% of the OSTCplus, or 35% of the OSTC4. It should be obvious that a display somehow has to compensate for the fact that it is small. The fonts in the center are smaller, less data is shown, and/or the...

With only 40% of the screen area of the Perdix, and about 34% of a OSTCplus, it should be pretty obvious that the characters have to be either smaller, and/or more dense, and/or less information displayed. That may be totally OK for an NDL diver for example, but as soon as you have more than...

The Teric screen is even smaller (1.4") than the Perdix (2.2"), let alone the Eon steel, OSTC plus (2.4") or the OSTC4 (3.2"). Sure if you like a wristwatch computer that you can wear in your office as well, Teric is nice. But many divers prefer a large display dive computer particularly if...

A friend who teaches both PADI DM and CMAS*** (commercially, not in a club) explained to me that their content is similar, but in CMAS you get a lot more theory (physics, gas planning, staged decompression, physiology, ...) already at the CMAS* and CMAS** level, compared to PADI AOWD and RD...

I don't know, as said I wasn't on the boat, but their website says that 40m max, no deco, 12l/15l single tanks, Nitrox maybe, but doesn't mention Trimix or twin tanks. Maybe they offer more than what's on the website but then you better confirm before booking.