Some operators have a lot of trouble with this, either through incompetence or through a logistical problem. For a couple of years in Cozumel I used a dive operator that had a lot of boats and made a big deal about their policy of dividing groups up by ability. I saw them screw that up enough that I stopped using them. I was once on a boat in which every diver but one was a professional. The other was on his first dive after certification.At this dive in particular I had made it VERY clear before I booked, as i booked and after i booked that while I'm certified I am a novice and looking for a novice dive. I don't know why they chose to put me on a boat with expert divers and go to that site.
The logistical reason is that they might not have enough divers of a certain ability or enough boats to make good groups. Years ago I did an advanced Cozumel dive (the Devil's Throat) and discovered afterward that a young couple on the dive were on their first trip after certification. The operator only had two boats, the one with the less experienced one was full, so he put them on the boat going to the Devil's Throat. Last year I went with an operator for two days who had only one boat. The first day was great--everyone was very experienced. On the second day, one of the divers was such a beginner that the DM gave her a buoyancy lesson at the beginning of the first dive and then held her hand (literally) for both dives. Everyone had to dive at her level of competence.
If you want to dive with a boat at your level in Cozumel, you really have to pick your operator very carefully.
That's because you went to Cozumel. Unless you are able to make special arrangements, every day will be like that. They do two tank dives. The first one will be well beyond 60 feet. The second one will be above 60 feet. If you don't want to dive below 60 feet, then you really should not go to Cozumel. If you insist on 60 feet for the first dive, you will be a very unpopular person on the boat, because that means everyone will have to dive at that level. The 60 foot limit is not a law.I guess that's my other concern... if I'm an OWD and certified to 60 feet... when i present that card and tell the shop that, shouldnt they be keeping me at sites in that parameter? If every boat is going to sites that are 80 or 90 I feel like I run out of choices.
Scuba insurance agencies differentiate between an "event" and an "emergency." To put it bluntly, an emergency occurs when an event is not handled properly. A blown O-ring is an extremely rare event--I've seen it happen once. It only becomes an emergency if you mishandle it. In the event I saw, the diver took off his BCD, shut off his air, fixed the O-ring, turned on the air, and resumed breathing, only taking one puff off of the regulator I was offering him in that time. Now that is extreme competence not expected of the average diver. But the average diver should be able to get an alternate from a buddy or make a safe ascent to the surface in that event.Compared to my first few dives I feel very comfortable and I feel that I've done a good job of staying calm in some cases where things go wrong. I don't expect that I'll do many things that will get myself into trouble. my biggest fear is something like an o-ring blowing and ending up in an emergency on my own.
First, little vocabulary: "buddy breathe" is a technique in which two diver take turns breathing off of one regulator. I am sure you were referring to using an alternate air source.I'm confident that I could safely buddy breathe and take care of myself, but if all my buddies screw off it could be harrowing... that's whats got me thinking a SpareAir or something would be nice to know. at least I've got 30 or 40 breathes in an emergency So I could either ascend or get back to the group.
Next, if you choose to use a Spare Air (the commercial product with that name), you will not get anything remotely close to 30-40 breaths. You will need something much more substantial if you want that much extra air.