Diving with a computer/watch

[dmaziuk]

Same if I was on nitrox and other diver on air. Why should I limit my bottom time by diving with someone when I paid a premium to have a longer NDL time ?

So what you're saying is, Land Fish's boat crew were complete morons, they paired a couple of computer-less newbies with seasoned pros who were happy to let them tag along while diving nitrox twins to a hundred metres, in a fog, inside a cave and uphill both ways? And you know that because you were there, and you didn't scream at them YOUR GONNA DIE!!!!?

Dive computers were our second gear purchase ever. I don't wear mine to the pool. I do wear my casio but only because I want to be out and packing before the lifeguards start turning off the lights and licking the doors. Edit: that was supposed to be locked of course but I'm leaving it as is.

 

[oly5050user]

So what you're saying is, Land Fish's boat crew were complete morons, they paired a couple of computer-less newbies with seasoned pros who were happy to let them tag along while diving nitrox twins to a hundred metres, in a fog, inside a cave and uphill both ways? And you know that because you were there, and you didn't scream at them YOUR GONNA DIE!!!!?

Dive computers were our second gear purchase ever. I don't wear mine to the pool. I do wear my casio but only because I want to be out and packing before the lifeguards start turning off the lights and licking the doors. Edit: that was supposed to be locked of course but I'm leaving it as is.

Now you are being silly. We are talking about recreational diving here. Your example would not have unprepared unqualified people on the boat.

---------- Post added November 16th, 2015 at 02:38 PM ----------

That's not the CMAS* cert I know. The one I know is more or less similar to a PADI OW cert. I wouldn't have more reservations about diving with a freshly certed CMAS* diver than I'd have about diving with a freshly certed PADI OW diver. Around here, both CMAS* and PADI OW requires six OW training dives, the last to be planned and executed by the student in cooperation with their buddy; the instructor is only supposed to oversee the dives.

PADI only requires 4 ow training dives. For an instructor to require more is a violation of standards when if student meets all objectives during the 4 dives.

 

[Storker]

PADI only requires 4 ow training dives. For an instructor to require more is a violation of standards when if student meets all objectives during the 4 dives.

It's not the instructor that requires 6 OW dives, it's our national standards. PADI can't overrule national requirements.

 

[dmaziuk]

Now you are being silly. We are talking about recreational diving here. Your example would not have unprepared unqualified people on the boat.

You said if a computer-less novice diver breathing air were to follow you while you were diving nitrox, they could get in trouble. While that's technically correct, there's so many things wrong with this statement, silly is the only reasonable response to it.

 

[Ouvea]

You said if a computer-less novice diver breathing air were to follow you while you were diving nitrox, they could get in trouble. While that's technically correct, there's so many things wrong with this statement, silly is the only reasonable response to it.

Hi dmaziuk:

As some of us have asserted, if the dive goes without any problems then everyone has dodged a bullet. It is not unreasonable for a dive teams using different gas mixtures to have different decompression requirements, given the identical dive profile.

Example:

Depth - 60 ft
Bottom Time - 50 Minutes
21% = 2 Minutes Deco (V-Planner)
32% = 0 Minutes Deco (V-Planner)

We need to migrate away from this mentality that "it's not going to happen or will never happen to me." It can and does happen. I just don't want to see something bad happen to our new colleagues. What's the point of performing pre-dive safety checks and then ignoring the deficiencies we find. I'm not saying that some problems cannot be managed by an experienced or inexperienced dive team, for that matter. However, diving without a means of gauging your exposure (depth/time/NDL) creates un-necessary risk.

Don't get me wrong here. I am not preaching to you nor am I dictating here. I just want to paint a scenario that may have you reanalyze your perspective.

O.

 

[Diver0001]

Although I agree and always wear a compass, I've got a distinct impression that it's not very common. Even among my clubmates, but especially for warm water resort diving. I don't know if the limited viz we have in colder waters makes it more obvious that one should carry one.

In Egypt I will wear a compass as well. I left it in my box during one dive and believe it or not, we got lost. Viz was great, maybe 60m, but we went left when we should have gone right due to swimming for a few minutes through the blue and arriving back on the reef on the side opposite to where we thought we were.

I think we swam another KM or so before surfacing and when we surfaced we were in the middle of nowhere. It took over an hour for them to find us. Thankfully the dive OP had good administration and they started searching early. We could still see the shore so it would have been possible to just swim back but the resort near where we surfaced actually phoned the dive OP and told them that there were two divers on the surface near their resort.

It was pretty embarrassing, to be honest. In our local waters we normally have about 3m viz and I always wear a compass and I can exit most of our sites within a few meters of where I thought I was. In this case, we surfaced over a KM away.

So yeah.....

R..

 

[Patoux01]

Depth - 60 ft
Bottom Time - 50 Minutes
21% = 2 Minutes Deco (V-Planner)
32% = 0 Minutes Deco (V-Planner)
.

You are aware that it is fairly simple to find 2 algorithms that can give over 5 minutes of difference in terms of deco, and both are considered safe?

 

[jboneng]

I'm not sure who you did your OW qualification through, but I did it through CMAS who DO NOT require any form of compass use during training.

At least according to the Norwegian diving foundations CMAS standards, compass training is a required part of the CMAS* training.
Including training in basic compass and navigation skills on land and a minimum of 250m surface swimming, navigating with the compass, faced down into the water and breathing through the regulator.

 

[Ouvea]

You are aware that it is fairly simple to find 2 algorithms that can give over 5 minutes of difference in terms of deco, and both are considered safe?

Hi Patoux01:

Of course, I can change the gradient factor or conservative settings for Deco Planne or V-Planner to provides various output. These parameters represent the level of risk you wish to have in planning your dive profiles.

O.

 

[Oldbear]

What tables does CMAS use?

Are they BSAC's 88s?