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A SS BP weighs about 3kg, 3kg you do not need to take with you in form of lead. If you use less than these 3kg of lead you might want to consider a Aluminium BP wich will weigh about half as much. You can mix all brands of BP and wing as long as you use the holes for the bolts (they are pretty...

Wounds should be given at least a week to heal before submerging them for an hour. I do not know what technique he uses for equalization, but pinching his nose will be painful and he has to make sure there is no internal swelling blocking the ear trumpet.

upstream regulators have a safety valve either built into the second stage, the hose or the first stage. As to answer the original question. A second stage supplying LESS than ambient pressure would be pretty much useless.

It is waterproof, so no deal soaking the whole regulator, and it has a spare O-ring on it, I have given that away more tha once in my short diving career :D

You will be fine with a XTX 40. if you wish it can be upgraded to a XTX 50 later by adding an adjustment screw.

There is no point of starting an argument under water. Reporting it to the captain was a good move. You are not the scuba police but you might have asked them if they had seen the freshly broken off corals, too.

Yes you can dive doubles and singles with Halcyon systems. BUT you will need different wings for each purpose. With Halcyon backplates you will need a STA, other BPs offer slits to thread cambands through so you can use them without a STA. OTOH switching from singles to doubles setup on the same...

a tiny drop of water between the contacts is enough to keep the dc on

I think I'll open a shop that rents bottomtimers :D

I think you answered your question here. You did not exceed an ascent rate of 33/40 ft/min AND had deepstops turned ON. If you turn OFF deepstops the safety stop should reappear.

I had a chance at last to get wet with my Predator set to medium brightness and the voltage is stable to the mV. Great divecomputer, excellent support and thank you to the community of Shearwater users here on Scubaboard who are always willing to share their experience.

keep your reg if you like at and service for it is available. the science has not changed and neither has the internal design, so no need to replace a working piece of equipment. piston regs can deliver more air per design than diaphragm regs can but both designs will provide you with more air...

There are beautiful lakes in the Tyrol and the Salzkammergut. There is a host of information on taucher.net including maps of places to dive. Tauchen in Österreich - Urlaub in Österreich. Infos vom offiziellen Online-Reiseführer der Österreich-Werbung is another site to look at and of course FB...

many divers try to keep gear from dangling around to reduce drag. A smaller wing that lies snuggly up to the tank will produce less drag than a larger one flapping in the current. Sidemount divers try to tuck the tanks as closely to their body as possible, so yes many divers are concerned about...

The Veo 2.0 will switch into Gauge mode as soon as a stop deeper than 21m (70ft) is required. Veo manual Dok.-Nr. 12-5201-r01 (11/3/09) downloadable from the oceanic site Oceanic Worlwide

the factor depends on the salinity of the water. see http://icp.giss.nasa.gov/research/ppa/1997/oceanchars/salinity.html

Fit is the most important point to look out for when choosing a dry suit. I recommend you go to a dive shop and try some suits on.

For me cards are only to show when checking in with an OP, so AOWD, Deep and Nitrox are the cards they want to see to let me dive the sites I want to go to. Skills is quite another chapter, but you do not neet a card to prove your navigational skills or your low-viz skills etc.

you can see the bubbles if you are losing gas.

Well they don't require any personal data, so I don' care who they are ;)