Is it prominent and should anyone categorically care? Well, it could be prominent - all depends on what you're going to do with it. Actually, many folks who may know what it is, don't altogether understand how this uncomplicated mechanical expedient can help avoid serious injury.
I got the query again the other day from a buyer on my dive watch site, so decided to get the rejoinder documented for others who may find themselves wondering the same thing.
As with many items, it's fairly intuitive to shape out how to use, and what purpose it may serve, assuming you have one in hand. But if that's not the case and your only interest in a stock with this highlight is to try and please man else, then some definitive facts would categorically be useful in determining if this very wordy, prominent sounding highlight is categorically desirable, or just a bunch of hooey.
To begin with, this is a expedient found on most any decent capability dive watch except for those providing the same highlight electronically by computer, instead of by mechanical means. It can also be found on watches not specifically made for diving, where it ordinarily serves only as an event timer, and not so much as a protection device.
To be precise, it is the relatively large, ordinarily metal, ring that encircles the crystal exterior the watch face. It generally has the same indicators or tic marks for minutes as the watch, with actual numerals designating each ten petite increment. It also has a pointer mark at the zero position to indicate a beginning point.
It's point lies in an capability to not only aid in tracking dive time, but doing it in a way that is somewhat failsafe. Along with depth, permissible breathing, rate of ascent, etc., strict knowledge of how long you've been down is principal to enjoying a safe dive. Getting it wrong can lead to Decompression Illness (Dci) resulting in injury or death.
There are some ways to apply it for separate dive profiles, but most often, it's used to time the whole dive. You align the bezel pointer with the petite hand at the start of your dive, and can tell at a glance how much time is left before having to ascend. The protection highlight of the bezel lies in its being unidirectional or one-way.
It can only be turned counter-clockwise - opposite the direction the hands are moving. That means if the bezel gets bumped hard sufficient to rotate, it will show a longer elapsed time, causing the diver to automatically err on the side of caution. By believing time is up and ascending earlier, they will avoid being fooled into staying down too long thinking they still had abundance of time left.
On a dive watch, a good rotating bezel will be easy to read, and fit snug sufficient so as to need a petite exertion to turn it. There should be internal indents which cause the bezel to ratchet as it's turned and allow it to "catch", aligning the pointer to categorically wherever the petite hand is pointing. Of course it must only rotate counterclockwise, and should also be knurled or notched around the outer edge so it's easy to grasp and turn in water or with gloves.
So now you know. Its usefulness and advantage are possible in its simplicity, and being purely mechanical, it makes a good backup for anyone electronic. In fact, even though having dived for years with a computer, I still apply a watch with this time-tested expedient for backup, and set it prior to every dive. Just like in the old days, it continues to add a well-known level of comfort.
Seiko seiko chronograph
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