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How do you know that she will be 55 lbs negative when her suit floods? I do understand that if you replace air in your drysuit with water that you will be less positive. But I think it is more complicated then your calculation. Or is there something I’m missing? (Maybe her body is positive...

I don’t know anybody who is using a 15 L twinset. I guess the length is the same as a 12 liter tank long model, but the diameter is larger. Because of the dimensions nobody is using a 15L twinset here. I use my 12L twinset for cavediving (sometimes also a bottom stage and deco stage) and...

We did use deco software on our smartphone in 2016 when I did tech 1. We had different smartphones and deco software and did use multi deco and IDeco. We compared the results and decided which plan we wanted to use. We did learn pragmatic/ratio deco. But we didn’t use it for dive planning. It...

No tables, just use multideco. We did the same when we were planning a dive during tech1.

If you are a solo diver it doesn’t matter what other divers tell you about that. It’s you own decision. But if you dive with a buddy which regulator should he/she use when your buddy is out of gas? Will you have enough gas for the stressed diver? And which regulator are you using at that moment?

At the Northsea I have done dives with a depth of 120-130 feet /36-39 meter with different gasses. Ean30 (+ oxygen), max depth 35 meter, average depth 31 meter. 25/25 + oxygen 21/35 + ean50 But I would never do a single tank dive deeper then 100 feet / 30 meter. I would use doubles and deco...

1-100 32% O2 110-150 21/35 160-200 18/45 210-250 15/55 260-400 10/70 source : gue_tech01_manualv1-1.pdf

It depends on the situation and goal of the dive. My personal preference is a 3 persons team in most cases. When cave diving I would never use 1/3 for penetration in a team of 2. Worst case situation 1 diver would lose his gas and then there is just 1/3 for each diver to exit. In a team of 3...

They should do. When I did tech 1 three years ago we did use deco software on our smartphone to plan a dive. When we did a 45/150 feet dive we did start the ascend with 9 meter or 30 feet/minute. At 33 meter or 110 feet we did change the speed to 6 meter or 20 feet/minute. At 21 meter we did...

A dive with doubles ean32 and oxygen in open water is for me tech1. Because I wasn’t allowed to do that with fundamentals. A dive with doubles ean32, stage ean32 and oxygen in open water is tech 2. I’m not allowed to do that because I’m not tech 2 certified. Cave: Doubles, bottomstage ean32...

When there is a restriction during a cave dive, your spg can hit stones when it is at the left chest d-ring. When the spg is at my waist d-ring I can even put it between my body and backplate. Maybe your solution is easier but not nicer.

When I did fundamentals and cave 1 the lecture did describe them as deepstops.

I did fundamentals in 2008. I didn’t learn minimum deco. I was told to use my dive computer or padi table to do my diveplanning. (Actually I should use the same method for planning as before my fundamentals, I didn’t learn a new method for planning.) Stops were starting at half of my depth. For...

We did a week of trimix diving. After the last day they did remove all the gas of the doubles because the price of the helium. A buddy wants his set filled with nitrox. At home he noticed his isolator was closed. One tank was filled with oxygen and one tank was filled with nitrox. You should...

If I order ean32 I would accept everything between 30,0 and 35,0.

What time was your surface interval?

How accurate do you think a dive computer is? I guess from every 3 divers one has a pfo. A lot of things have impact on your “ndl”. (Water temperature, electric heating, body fitness, stress, work during the dive, dehydration and more.) Actually your dive computer is also a rough approximation...

Start a reefdive with 200 bar, go to 30 meter depth. Go slowly shallower and turn the dive at 100 bar at 18 meter (20-25 minutes divetime) or something like that. Go slowly shallower to 10 meter (40-50 minutes divetime). Do a safetystop. Surface with a tankpressure of 40-50 bar.

It’s funny /ironic. Here at cmas/nob 1/3 of the divers is instructor. There are a lot of instructors at cmas/nob. All my cmas/nob dive buddy’s are instructor. (But it is hard to find a (good) instructor to give a training.) But it’s also said, almost all my cmas/nob dive buddy’s told me about...

I agree, thanks