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As commented by Hatul. The graph doesn't show everything and doesn't always match reality. You may have done something during a 20 sec interval that caused the DC to log an alarm but you won't necessarily see what you did on the graph. As you still have a low number of dives you are probably...

At least mine did. Great photo. Demonstrates what I was trying to describe in words. You can see some of the teeth of the moving quadrant.

It was an Italian model, metal body with a screw top that did need some work to loosen because of corrosion at the start of the thread. I soaked in WD40 and flexed the whole case very slightly several times in a vice. Then finally I applied a metal worm gear hose clamp to the outside to get good...

Looks like a solution may be on the horizon: "Scientists in the UK claim to have found a way to mimic the functions of GPS without sending anything into space. Known as a ‘quantum compass’, this revolutionary method would use the subatomic effects on Earth’s magnetic field...

Probably just as well that we can't see what's really in sea-water. From: National Geographic photo reveals contents of SINGLE DROP of seawater | Mail Online

I've been diving my VYPER for many years now and I've always found it very predictable with just the amount of conservatism that I like to have. But I wasn't prepared for what happened on one particular dive. My wife and I got on the boat with the tanks filled to EAN36 and EAN40, the plan being...

That's fine but don't forget if you're discussing a dive light you need to do this underwater because of refraction when the beam leaves the light.

Nice tip. To build mine I took the BCD connector off an old (surface) Dive-Alert that wasn't whistling properly any more. The connector just unscrewed and when I measured the thread found it was 3/8 UNF. So it just cost me one female-female adapter 1/4NPT-3/8UNF + 1 cheap low pressure manometer.

Something wrong there. 12V x 2Amps = 24W. Not 18W 18W should pull 1.5Amps @ 12V 8ohms @ 12V will pull 1.5A and dissipate 18W If you're going to use a resistor remember that it will run very hot and you should buy one rated for more than 18W. I'd go for a series or parallel combination to...

Deeper dive as 2nd dive is common practice on the 1st day of diving at many locations I've visited, the reason being that the 1st dive of the trip is an easy shallow dive to check everyone's equipment and weighting. Once it's confirmed that everyone is ok then off to do a deeper more complicated...

A lot of people place the mask strap too high on their head so the mask gradually pulls up against the base of the nose causing the mask to curve outwards and break the seal on each side of the base of the nose. Try to ensure that the mask on the upper lip is not pressing on the base of the nose.

I had one that was sticking so I bought a new one to replace it. I then opened it up just to see and it turned out to be easily repairable. There was a brass pinion gear that turned the pointer and this was operated by a toothed quadrant attached to the expansion tube. The pinion teeth were worn...

His profile says "male" and that ain't purple, it's pink. :no:

Just for the record, my wife did have an EVD. Also as from a couple of years after the event we didn't impose any limits on our diving and we have been diving regularly including a number of dives into the 40-50m range.

Update: Get off my lawn! Men officially turn grumpy at the age of 70, study claims Results were found by examining a group of pensioners over 15 years Stress reduced after age 50 but increased again as the men grew older Reasons included poor health, mental decline and family members' deaths...

No, that's a 100% markup or a 50% margin.

In my experience if a housing is going to leak it will do so in the first couple of meters. As you go deeper the housing parts are pressed together by the pressure normally improving the seal. Then as you get a lot deeper one or more of the buttons may either self operate (my Canon housing) or...

If there's one thing that does distract on a night dive it's a tank flasher on the diver ahead of you... Please, just use a colored tank marker with a steady output rather than one that flashes. There are various colors to choose from.

The article states: The document specifically names Boulder County sheriff's deputies, a member of the Westminster dive team, Broomfield and North Metro Fire Rescue District.

I did a couple of dives once with a standard, oil damped compass. It worked just fine until the spring that operated the ratchet of the rotating bezel rusted and jammed. When I forced the bezel to rotate the spring broke up and came out in pieces after which the bezel rotated freely. For me the...