Category Archives: ScubaBoard News

Dive dry with dr. Bill #608: A sea full of jelly... fish

DIVE DRY WITH DR. BILL #608: A SEA FULL OF JELLY... "FISH" Recently I once again had the pleasure of spending time with a group of Japanese divers and scientists from Shibuya Diving Industry near Tokyo. I had met Masanobu Shibuya back in July when he and members of his team visited Catalina to film…
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Dive dry with dr. Bill #604: Such sensitive and mysterious critters

DIVE DRY WITH DR. BILL #604: SUCH SENSITIVE AND MYSTERIOUS CRITTERS Two summers I wrote about the light sensitive sea cucumbers I'd "discovered" in the dive park. You know, like Columbus "discovered" the New World... it was already there and the natives knew it (as well as a number of ancient cultures from Asia, Europe…
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SEI collaborates with YMCA of the USA to service YScuba divers with replacement cards

Effective August 31, 2014, YMCA of the USA (Y-USA) no longer replaces lost or damaged Y-SCUBA certification cards. Y-USA does not support any part of the former Y-SCUBA program but recognizes that some divers who achieved a lifetime SCUBA certification may require a replacement diver certification card. Y-USA had previously discontinued the SCUBA diver certification…
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SEI collaborates with YMCA of the USA to service YScuba divers with replacement cards

Effective August 31, 2014, YMCA of the USA (Y-USA) no longer replaces lost or damaged Y-SCUBA certification cards. Y-USA does not support any part of the former Y-SCUBA program but recognizes that some divers who achieved a lifetime SCUBA certification may require a replacement diver certification card. Y-USA had previously discontinued the SCUBA diver certification…
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Diving With Whale Sharks

Diving With Whale Sharks Whale Sharks, Rhyncodon typus, are the largest cartilaginous fish in the world today. The largest ever recorded was just over 41ft long, but rumors by fishermen say that they may grow over 46ft in length which makes whale sharks the second largest cartilaginous fish ever to exist and places them only…
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Dive dry with dr. Bill #601: By-the-wind sailor home from the sea

DIVE DRY WITH DR. BILL #601: BY-THE-WIND SAILOR HOME FROM THE SEA Several years ago, I wrote a column about a marine critter that Tina Quinn and Cindy Rinehart brought up to my house for identification. In that column I stated it was a by-the-wind-sailor, known scientifically as Velella velella. Today I have to apologize…
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Quick Refresher on Basic Underwater Navigation

Basic underwater navigation by means of simple observation or use of a compass and depth gauge remains a fundamental and essential skill for all divers. For most short excursions, these are the only instruments needed. Even when using advanced navigation instruments, basic navigation skills provide an important backup. Much navigation can be accomplished by observing…
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Air integrated dive computers

Air integrated computers, that is, a dive computer receiving wireless information from a transmitter on a regulator’s first stage became widespread in the last decade, but are still frowned upon by many divers because of perceived reliability and safety issues. I think this is unfortunate and undeserved, and as such I invite you to examine…
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Dive dry with dr. Bill #594: Back from bonaire

DIVE DRY WITH DR. BILL #594: BACK FROM BONAIRE As regular readers of my column know, I decided to celebrate my latest birthday by doing something I've never done on any prior birthday... flying in an airplane. Yep, at the stroke of midnight on June 11-12th my plane took off from LAX bound to Aruba…
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Adaptive Algorithms

In the 1990s, Professor Albert Bühlmann (1923 – 1994) wanted to reflect the change in blood perfusion to various body organs when the diver is subjected to temperature and/or workload variations, as changes in blood perfusion would alter the inert gas saturation tolerance. In other words, he wanted to develop an algorithm to deal with…
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Dive dry with dr. Bill #587: A mother's day orgy

DIVE DRY WITH DR. BILL #587: A MOTHER'S DAY ORGY I was alive during the 1960s and I actually remember much of it... well, most of it anyway. The days of sex, drugs and rock-n-roll were indeed "heady" days (if you get the pun). Although I looked like a full-on hippie or political radical, my…
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