Hogarthian Diving

Articles about Hogarthian diving, and DIR phylosophy.

Surface Marker Buoy

Mar
28

What is it?
The surface marker buoy (or SMB) is an essential piece of equipment which allows a dive team to mark their position either on the surface or underwater.

Why should I have one?
Just as with backup lights, SMB's are not only for technical divers. Marking one's position in the water with an SMB may be the only form of communication between the boat and the diver in less than optimal conditions.

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Standard Gases by JJ

Feb
15

Before I begin any discussion of the specific gasses I chose for GUE I want to reiterate a few aspects to standard gas selection. I recognize that this may appear to be old hat but some of the concerns seem best answered in this format. Please recognize that the constituents of a particular set of standard mixes are less important than the utility of standard mixes in general. In other words you can always find a "better" mix at a given depth; this is also true for a range of depth segments.

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History of the Back Plate

Jan
26

By Greg Flanagan
In 1979 cave diving was still very much in its infancy and as a junior at the University of Florida, I was privileged to be taking the first cave diving course offered by the newly formed NSS Cave Diving Section, taught by none other than Sheck Exley.
The serious cave rigs of that period included double 104s worn with a Navy harness or a simple three strap harness, both of which consisted only of stainless steel tank bands and webbing. There rigs were used in connection with a belly-bag BC for buoyancy control. 

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GUE EDGE

Dec
27

Updated Pre-Dive Checklist

G - Goals - What do you want to do? Whats the plan?
U - Unified Team - Who does what? what order?
E - Equipment - Have had two different instructors do slightly differentthings. One does the equipment matching check here. The other just goes over any specialized equipment needs. i.e. Reels, scooters, cameras and the like.

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Understanding Balance & Trim by Quest

Dec
02

BY TAMARA KENDEL

Good trim requires that a diver move through the water in a horizontal position with the feet up. Most divers swim in a foot-down position using a kick that gives downward thrust. This attitude increases the surface area of the diver that must be pushed through the water, which requires more energy and increases air consumption. Also, much of the downward thrust caused by the kick is effort wasted against poor buoyancy control-- part of the kick must compensate for the diver’s lack of neutral buoyancy. It is also crucial to realize that the feet-down position will lead to dead coral, bad visibility and damaged cave, all of which should be important issues for divers.

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Valve Drills

Nov
30

The purpose of the valve drill in a training scenario is to familiarize the diver with the proper use of the valves on their manifold and to prepare them to deal with some of the failures that might occur during the dive.

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What Size BC Wing Should I Buy?

Oct
30

When diving, your wing needs only enough lift to compensate for the weight of your breathing gas plus the compression of your exposure suit at depth. Those using suits which don't compress much, such as dive skins or drysuits made of trilaminate or crushed neoprene, will also want some extra lift in order to be able to float comfortably on the surface. And of course the whole rig needs to float by itself if you doff it at the surface.

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Why not use bungied wings?

Oct
02

The use of bungied/bondage wings is strongly discouraged. To start with, one of the primary reasons stated for their use is that they streamline your rig. Ironically, they generally do the exact opposite. Hydrodynamics dictates that rough surfaces create increased turbulence which consequently increases drag. The bungies create a very rough surface and thus are adding to drag. Furthermore the bungies have a tendency to trap air which cause both static and dynamic instability issues.

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Baker's Dozen for not using a Dive Computer

Oct
02

By Jarrod Jablonski

  1. Dive computers tend to induce significant levels of diver dependences, eliminating the awareness so common and essential to all diving but particularly obvious when diving tables
  2. Dive computers do not allow proper planning as divers can't properly "study" the impact of various mixture and decompression choices.
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MANIFOLDS: WHY USE THEM

Feb
20

The following discussion is only relevant to diving with a twin-set.
Having two first stages means that you have a back up should one of the 1st stages fail. If one regulator fails you can simply “shut down” that side by turning off the pillar valve of the relevant side and switch to breathing off the other regulator.  By having your dry-suit inflator coming off one side and your wing inflator off the other you also achieve redundancy (i.e. back-up) of buoyancy control.

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