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Post by mrfett2000 on Jan 4, 2005 13:12:47 GMT -5
After my wife got her new Invicta, I started looking for one for myself. As I looked at different styles and showed her those styles I used the word "bezel". I knew what a bezel is. I just don't know what the true purpose of a spinning bezel is.
Does a scuba diver use it for timing of his oxygen supply?
My cheapo Relic watch I'm wearing has a compass on its bezel, not time increments.
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Post by BrianHud on Jan 4, 2005 13:37:50 GMT -5
Generally you would use a dive table to determine you max depth and total bottom time for a dive. When you get into the water before the descent, you set it for what you determined your bottom time to be for that particular dive.
I personally use a dive computer for that (US Divers Scan 4). I don't think anyone really uses their watch for that purpose anymore, but if they do, they are depriving themselves of diving time. The computer uses algorithims to determine your actual depth, oxygen absorption and surface interval. If you rely on, for example, the US Navy dive table, you will get much more conservative results that are unnecessarily strict.
Dive watches are still very popluar as style. I happen to love them, but they are no longer necessary for any dive timing.
Brian
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Post by JBHII on Jan 4, 2005 14:17:06 GMT -5
Generally you would use a dive table to determine you max depth and total bottom time for a dive. When you get into the water before the descent, you set it for what you determined your bottom time to be for that particular dive. I personally use a dive computer for that (US Divers Scan 4). I don't think anyone really uses their watch for that purpose anymore, but if they do, they are depriving themselves of diving time. The computer uses algorithims to determine your actual depth, oxygen absorption and surface interval. If you rely on, for example, the US Navy dive table, you will get much more conservative results that are unnecessarily strict. Dive watches are still very popluar as style. I happen to love them, but they are no longer necessary for any dive timing. Brian Brian is correct. That's why most dive watch bezels only spin in one direction - if you bump the bezel underwater, then it only shortens the length of your dive (safety consideration). Although I'm not a diver, I will add that I've read testimonials from many serious divers who actually do use their dive watches as a back up to the modern digital dive computers. It's scary entrusting your life underwater to an electronic device....  |
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Post by BrianHud on Jan 4, 2005 14:46:29 GMT -5
John,
You're probably right about divers using their watch for backup. I usually dive on boats with a dive master who sets the dive up for you, and tells you what the bottom time is going to be, and then one who guides the dive.
If your're diving on you own, correction, with your dive partner, you might take this extra safety measure. I usually take note of the time on my watch after I'm told how deep and how long a dive is going to be and turn the bezel to the corresponding number of minutes when I get into the water.
The deeper, the shorter. I usually like to see how long I've got before we're going to start ascending....plus I'm a watch geek so I have to wear a dive watch when I'm going into the water.
Brian
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Post by mrfett2000 on Jan 4, 2005 14:51:14 GMT -5
well, I don't think there will be any diving in our near future.
Is there any purpose to my Relic having a compass-like bezel? (other than annoy people in a quiet conference room when spun)
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Post by MikeS on Jan 4, 2005 21:12:56 GMT -5
not really unless you always track your direction!
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