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The Apeks DST first stage can also be modified (Apeks kit) with a fifth LP port in the end, but you have to rotate the reg around and have the environmental seal exposed facing up and out (which I'm not a fan of). If that doesn't bother you, then you're good. The rotating turret is considered a...

I suspect, and Gombessa (who estimated its position for the map) agrees that the position of Lone Metridium shown is probably inaccurate, and may well be on the feature north of and slightly east of the point shown, along the 70 foot contour. When I checked the depth there, LM was at 61 feet on...

Looking at the poll data, I'm guessing that the need to get away from siblings to somewhere more quiet may have been the motivating factor for many who find doing things solo enjoyable. While the # of children per woman is probably lower now than it was when the majority of active divers were...

Yes, the new body on the 180 Gen II (which I have) and all the 220s have beveled edges on the hole, so they don't saw through cave line. Guy

Haven't used them that much yet, but so far I've had good expereinces with my Dorcy Penetrators. I got them at Piranha: LED Lighting Products Piranha Dive Manufacturing on sale for something like $35 each (I got the slightly older 180 lumen version in the new body). They have a tight spot...

And what hasn't been mentioned yet is that the valve may have gotten opened while it was being transported to the site, so the shop didn't necessarily give the OP a short fill. This is why you should check your tank pressure when you pick them up, and again before you dive them. You'll also...

Thanks for that. I think this earlier study by the same author: Modeling pulmonary and CNS O2 toxicity and estimation of parameters for humans -- Arieli et al. 92 (1): 248 -- Journal of Applied Physiology may be even more what we're looking for as it includes data from humans, although If...

I believe that just explains that you add the values together for multi-level dives. The formula for calculating the multiplier for OTUs is given in the NOAA Diving Manual: [(PO2-0.5)/.5]^0.83. According to the manual, the exponent was determined to give the best fit curve for the data. The...

It used to be like that in the city, too. Oddly enough, most of were neither abducted, molested or murdered. Which isn't to say those weren't issues (we had our local 'Chester the Molester' that the kids all knew to stay away from), but our parents seemed to assume that they'd given us enough...

For a wicking layer you can just go to REI and buy their house brand, if they fit you. I use LS medium weight tops, either a crew neck or Zip-T. The Zip-T's more versatile in hot weather, the crew neck less likely to get caught in my neck seal and let water in. Figure ~$35-$40 for one. As far...

I second the recommendation not to do your first local dives off a boat; there's no need to, as we've got plenty of great shore diving to introduce you to the area (just wait until you get to try Pt. Lobos), and people willing to take you out. Cold water diving is different, and you should get...

Yes, you can. Normal auto glass screens out UV-B but not UV-A (at least according to this month's VIA magazine from AAA). The tempered glass in a scuba mask should do the same. It's possible to get auto glass that also screens UV-B. Personally I've never noticed a problem locally even though...

The Gekko doesn't have a gauge mode. Most likely problem is the depth sensor, as already mentioned. I've had a Gekko work just as it was supposed to, go through its self checks after manual turn on, etc., right up to the point where I submerged. As far as the computer was concerned I'd never...

[head slap] Doh! Too late now. Guy

The sole mention of a 90 minute SI I can find in the NOAA diving manual (4th ed.) is the following (pg. 3-22): "If more than one dive is made to the maximum exposure of a PO2 of 1.6 ata, a suggested surface interval of at least 90 minutes is advised between dives (three dives of 45 minutes...

I think this is well beyond the advanced forum and falls under the technical category, which is partly why I first asked it in the DIR forum. It's possible that the Hogarthian or NEDU forums may have someone who knows the answer, although many of the people who read the HOG forum also read the...

Apologies if you felt that was aimed at you, I just wanted to get people (who didn't see that thread) up to speed on the generally agreed reasons why we liked soloing, so that we wouldn't use a bunch of bandwidth going over the same ground. And as suggested by the post that follows yours, birth...

If it's in the Nitrox or Mixed gas chapters (15 and 16) I can't find it, nor did I see it in the Physiology chapter (3, IIRR) or the index. I'll have another look through. Interesting, I wonder when they introduced this, because they had several tox incidents and one fatality while training...

Thanks anyway. Guess my next stop is TDS and/or RBW. Somebody has to know where this came from and what it's based on. Guy

I originally asked this in the DIR forum but no one could answer it there, and it was suggested that I re-ask it here. It was stated in my just-completed Fundies class that GUE assumes that your CNS loading % decreases by 50% after a 90 minute SI. I checked the NOAA diving manual whence the...