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I suggest you and your doctor consider ordering a "CT Calcium Test." Here's why. Some years ago after performing triathlons I had similar racing heart rate experiences in which I felt dizzy and faint while standing around to find out results. I was a diver, too. Like you, I couldn't reproduce...

I've noticed that in the last year the data collected by my Vytec and Cobra show "0" pressure at each sampling moment. I dive with both computers on each dive. The Vytec is air integrated, and the Cobra is connected to a high pressure port. I see the phenomenon when I look at the pressure...

This is a new, 2011 suit. I used it only once, on sand in shallow fresh water, to determine weighting for it. The suit is stylish and extremely warm. The torso is 8mm, and the arms and legs are 7mm. Water intrusion is almost nonexistent, a result of the sealed seams, shoulder gasket, hood...

The full description of these boots is Henderson H2 Hyperstretch Hard Sole 7mm Boots. They are size 9 (mens), which is equivalent to 10 (womens). These boots are essentially new. I used them only once, on sand in shallow fresh water, for ballast checking. I paid $84 for them. I'm pricing...

I always have a folding snorkel in a pocket, just in case. On a boat recently somebody had their snorkel strapped onto their leg, like a knife.

Does Sea Experience rent tanks? Can I leave my gear with them overnight, including hanging my wetsuit?

Does Underwater Explorers rent tanks? Can I rinse my gear at their dock and store it there overnight?

Use DiveRite's plastic lock clips. They drop over the webbing with a "sissor" action. You snap the open ends together with pliers. You can open them again to move or remove them by prying with a screw driver. They hold securely and retain the weight pockets. Works great for me. Here's the...

I tied a line to my (full) 19 cuft pony, rigged for slinging, submerged it in salt water, and weighed it with a battery-powered "fish" scale. It weighed 3.5#. I treat it as part of my ditch weight.

Did you know about DAN's SMB? Overpressure valve, reflector on one side, pocket on top for a light stick, handle on bottom, plus other details. Includes a little pouch with a whistle, mirror and lightstick. Reasonable price, good cause.

Yes, the boat operators require it. I don't know the history behind it, but I know that NJ technical divers have long been leaders in working out solutions to challenging ocean diving, and I suspect the pony was one such solution. One of the challenges is that typical dives are in cold...

How do I do that? Ask for his numbers? Ask if they're OK? What if he's an instabuddy? Suppose his numbers are out of bounds. What then?

I was involved in an incident that could have turned serious. A diver panicked at 80 feet as a result of running low on air, and instead of going to the surface he struggled to launch an SMB (which he'd never done before). He made several more errors, including inflating(!) his BCD on the way...

I was recently on a drift dive on which the following incident occurred. I'd like to get your reaction to the events I describe, especially suggestions for me, the subject diver, and the dive plan. Fortunately, nobody was hurt. There were six of us on a fast, timed, drift dive at 80 feet in a...

How do you communicate your pressure numbers to your buddy underwater?

We're involved in semantic distinctions--using the same term for different things. Long ago watches were invented, i.e., timepieces, that you wear on your wrist. Then special time-related functions were added (timer, alarm, etc.). Still watches. Then other, non-time-related functions were...

I started out a few years ago with a Cobra 1 on a HP hose, instead of a console. So I get all the usual console stuff plus deco information. In case the batteries were to die or it would otherwise stop working, I backed up the Cobra with a Suunto D3 bottom timer, so I'd have depth and time for...

I use an Apollo folding snorkel. It folds into thirds, and I keep it folded with a rubber band. I carry it in a drysuit pocket with other bits, or a waist pouch if I'm diving wet (I use a backplate and wing, so no BCD pockets). After the dive I unfold it so it doesn't take a set. It works...

I'm going to be diving in the Brockville area and was wondering where's the best place to get my Nitrox fills. I've come across Abucs Scuba and Dive Tech on the internet. Is there a reason to prefer one over the other or should I just pick the one that's more conveniently located? Are there...

Here's a perspective on what dive computers, bottom timers, and dive watches do for you. As we learned in OW class, critical things we need to know for a dive are depth and elapsed dive time. We used these in class to plan our dives so as to avoid decompression obligations. A dive computer...