Delta P makes a good quality dive computer, and the latest VR3 is no exception. Their computers are fairly easy to use (once you read the manual!), and the new VR3 HD dive computer ships out with the latest version of the software (G10 mode) enabled, but you can switch back to G3 (three gases), or X10, which is the 2007 version of the software. So that means if you replace an older computer, there's zero learning curve if you don't want to use the new features, like the ability to customize the information you see on the primary dive screen. They also do a little bit of up-selling- when you first open your VR3 it's a color display for three dives, then it goes back to single color, unless you order the color upgrade PIN. Of course if you bought it with multicolor enabled, you should get the pin on a white strip in the box.
The VR3 HD uses a single AA battery, which you can open with a special key that comes with the computer. If you can complete a battery change within 30 seconds, you won't lose any data. The computer has two buttons, and you activate them by either pushing one or both. A short push or a push and hold gives you the variety you need to activate all the functions. The backlight can be set to be on for 10 seconds, on all the time, or off at the surface and on underwater.

VR3 Dive Computers can operate on four levels :-
Level C1: Open Circuit Air / Nitrox
Level C2: Open and Closed Circuit Air / Nitrox
Level C3: Open Circuit Air / Nitrox / Trimix
Level C4: Open and Closed Circuit Air/ Nitrox / Trimi x

On the home screen of the dive computer you can see the current active gas, battery level, and the amount of gas you have left. VR dive computers use a derivative of the Buhlmann ZHL 16 algorithm on all decompression dives, the VR uses 2 minutes stops. You can also upgrade to an alternative algorithm, which uses a variable permeability model (VPM). This may provide a reduced decompression requirement. In general, intermediate stops are longer and shallower stops are shorter. The VR3 has No Stop plan for depths up to 41 meters, so you can avoid decompression stops altogether, provided you following depth/time recommendations. There's also a fly time- which tells you how long to wait before flying to make sure all the gas has cleared.

Options include a gas calculator mode (another PIN upgrade), which allows you to work out partial pressure gas fills. You can also connect a re-breather linking cable to track real time decompression. The VR3 dive computer also has some games you can play on decompression stops, such as Octopus, where you're shooting another octopus with ink. Buddies is a pairing card game, and Wreck find you're looking for pieces of a shipwreck in the sand. An upgrade allows you to download decobooks- the computer will store about 40 pages, loaded as text files. You can download dives to a computer (it stores up to 22 hours before overwriting the old data), and there is a simulate mode so you can practice using the dive computer before you actually get wet.

Once you have entered in your dive gasses, a dive plan function allows you to enter dive depth, time, and surface interval to calculate a set of backup tables. One of the cool features of using a dive computer, and the VR3 is no exception, is that if you have just completed a dive, it remembers your residual gas loading and uses that in the calculations. This is much easier than the tables (of course you should always run the calculations on tables as well, so you have a backup to the computer). The VR3 dive computers provide alarms for ascending too quickly, when to stop on a decompression stop, and when to ascend due gas levels.

Specifications from the manual:

Depth limit 150m (calibrated)
Time limit 9999 mins and 59 seconds
Max deco stop 99 levels
Number of gases 10
Battery life Up to 100 hours
Sleep Approx. 1 year
Dive memory Approx. 80 hours
Record resolution 10 seconds
Logbook dives 99

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	InvisibleSHIELD - VR VR3 Dive Computer (Screen) - VRVR3 See Reviews For This Product
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	Delta P VR3 HD Dive Computer See Reviews For This Product

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Imagine being able to check all of functions of you diver computer without your hands- the Oceanic Datamask HUD dive computer allows you to do just that. Integrated in the mask is a small LCD panel that shows you depth, psi of air in your cylinder, time, and decompression stop info, which you can see continously, without having to use your hands. The display is magnified and backlit, so you can tune it to your your preference to make it visible, but not obtrusive. So if you need your hands for something else, no problem, your dive information is always right in front of you. They pull this off by using a wireless interface, which among other things allows you to see how much air time is remaining. Like all good dive computers, there are audible alarms when you ascend too quickly, you're low on air, spend your allotted amount of time at depth, etc. It also has user replaceable batteries, and allows uploading of dive data to you your computer.

The Oceanic Datamask HUD was developed for the special forces, a variety of their missions are in challenging environments with low visibility, and they frequently need both hands to handle equipment required to accomplish the mission. Also, in some conditions lighted gauges would be a liability and interfere with their ability to stay camouflaged. They worked hard to make sure the dive information was readily visible, but did not interfere with vision, hence the location just outside your normal field of view, on the right. During development they discover the numerals were too small to read when placed that close to the eye, so Oceanic had a custom magnification lens developed for the Datamask HUD. The mask was readily accepted by the military divers who contributed in it's development, and also has applications with recreational divers, public safety divers, and handicapped divers who may not be able to operate a traditional dive computer.

The Datamask HUD is a technological advancement on the traditional dive computer, and Oceanic should be congratulated on advancing the science supporting not only our military divers, but recreational divers like you and I. If you'd like additional details, here's the manual at from Oceanic.

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The Aeris Atmos II Dive Computer comes with a number of features that can help make your dives safer and more efficient. First, the computer is compatible with nitrox diving. This is important, as nitrox diving is growing in popularity. Secondly, the Aeris Atmos II Dive Computer comes with an audible alarm with flashing LED light. It’s easy, then, to notice when you’ve been under the water for too long, have missed scheduled decompression stops or have dove too far under the surface.
Like all top-of-the-line dive computers, the Aeris Atmos II Dive Computer allows users to store several dives’ worth of data. Once you’re back on dry land, you can then download this data to your personal computer. This lets you analyze your most recent dives, allowing you to track everything from the average length of your most recent SCUBA adventures to the average depth under the surface that you traveled.

Because it is a high-end computer, the Aeris Atmos II isn’t cheap. Expect to pay anywhere from the mid-$600 range to the high-$700 range for this computer. Is it worth it? That depends largely on the type of diver you are. Are you a frequent diver, one who counts SCUBA as a passion? If so, the investment in an Aeris Atmos II might be a wise one. It’s a diving computer that comes with all the bells and whistles. If, on the other hand, you are only an infrequent diver, the Aeris Atmos II might not be a necessary purchase. A dive computer is still a worthwhile investment. But it’s possible to find one that is far less costly.

Remember, a dive computer is not a luxury item. It’s a necessary tool for divers hoping to stay safe and avoid decompression sickness. Divers suffer this sickness when they ascend to the surface too quickly. A dive computer, though, can prevent divers from doing this. Is the Aeris Atmos II Dive Computer the right choice for you? Study your own diving habits for the answer.

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