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I've stayed at Casa del Mar many times but it's been awhile. She'd want a ground floor room, but my recollection is that there are about 5 steps to go up (or down) from the lobby to the ground floor. Though not Casa del Mar or Blue Angel accommodations, right next door to Casa del Mar (between...

Deep Blue leaves from a dock downtown at 9am, but I agree with others that have suggested staying on Cozumel.

The link to the chart I used is in Christi's post #29 on this thread. It's good to read her notes about the chart too. I've been there in January several times and haven't missed a day. February, yeah. March, yeah. Even April. You never know. I've just been lucky. Personally, I...

If you consider Christi's really cool chart to be hard data, January is the most consistent month in terms of port closures. It's the only month without a blank. February comes in second with only 1 blank year. Cumulatively from 2010 to 2017 January has the most closures with 17. October...

About the easiest way to 4 tank is to be dropped at a beach club or restaurant south of the marina, like Playa Paradise or the Money Bar. I'm curious as to other possible places to be dropped. I've only been dropped at those two places. You have some lunch, and then the dive op picks you up...

Across the street from the Park Royal and a little north is the Atlantis Submarine center. The museum, downtown just a couple blocks (?) north of the square, is a neat couple of hours. If you're asking about after your Tulum trip, I'm a fan of Xcaret. It's an all day kind of place and I...

I was a new diver on my second trip to Cozumel. It was the 4th tank that day and I think we were diving Cedral. The current was moving pretty good. There were 7 divers including myself and a DM. Another diver and I were with the DM and the other 4 were behind us some distance. We came up to...

Roberta's Scuba Shack is right between Casa del Mar, the Park Royal, and right across the street from Roberta's hotel, Village Tan Kah. Getting on and off the boat at Scuba Shack is very, very easy, practically a level step and in a protected cove. VTK is a very small place (12 rooms?) with a...

Rain doesn't shut down diving. Bring the gear. Also, it's very common for it to show rain, and it might rain somewhere on the island for a little while, but it doesn't generally rain hard or all day. Wind from the North can shut down diving, but the rain does not. If you want to be best...

Also, I've not been to the new marina yet (it's essentially where the old marina is/was), but once upon a time you could get food at the marina. There wasn't really a restaurant, but kind of a little convenience store and I think they had some hot food. Again, 3Ps will know the options...

As ChuckP mentioned, being dropped off for lunch is the way to do it if you're doing 4 tank days. If your second dive is south of Playa Paradise, PP gives you the most lunch time. If you're north of there, the Money Bar will be easiest for the boat but will give you a little less time. They...

Well, didn't actually forget the square profile, just treated it like a table dive, but didn't consider the NDL issue of a square profile table dive for that length of time, that depth and that mix.

I must be misunderstanding/misusing the NOAA Oxygen Exposure table. Or misunderstanding the term "CNS clock". Or something else. What I'm seeing is that the limit for 1.2 ppo2 diving is 210 minutes and that the limit for 1.4 ppo2 diving is 150 minutes. So, in the first example I used, after...

No CNS clock problems doing two 90 minute dives to 95 feet on EAN36 in one day? How about four 1 hour dives, same mix, 75 foot max depths?

7 feet below the MOD for a few minutes probably isn't the end of the world. Would you do it on 36%?

No, Only air.

Right, and I'd be inclined to heed that advice. Maybe they weren't specific on which of those 4 dives to use nitrox? It's a guess, but I suspect they would suggest dives 2 and 4. Maybe they didn't ask the shop about diving just one tank of nitrox per 4 tank day? Another guess, but I suspect...

The depth the DM may have been talking about was probably with regard to first dives. Second dives generally have a floor. There are exceptions, of course but for the most part, that's what happens. You'll likely be doing those 2nd and 4th tanks at reefs with a floor that's above the MOD...

I think it's probably a couple blocks, but as judydivescoz mentioned, they rinse and handle your equipment. I'm not sure about rinse tanks at their shop, but for the most part you'll only be dealing with neoprene and cameras, etc., if you have your own. I have neoprene and cameras and...

Glad it was basically accurate. I checked the link but had no way to check the programming.