How A Dive Bezel Works – Windup Watch Shop

Instantly recognizable at a distance, the dive watch bezel was first invented in the 1950s during the glory years of SCUBA (self-contained underwater breathing apparatus) diving. This was well before dive computers were invented, and recreational divers needed a way to track their bottom time, which is the total time spent underwater. The bezel is a reminder to prevent divers from exceeding their diving time limit with limited oxygen. Why is bottom time crucial to monitor? Because a diver can only stay at a certain depth for a limited time before exceeding safe nitrogen levels.

To avoid serious issues, divers must pay attention to the “no decompression limits,” and there is a simple rule for calculating these limits. Remember the “120 rule”: 120 minus the maximum depth equals the amount of time, in minutes, that you can stay underwater. For example, if your maximum depth is 80 feet, you can stay underwater for 40 minutes. Now you know why some older Citizen Aqualand watch straps used to have the NO DECO tables printed on them. Staying longer than the limits will require decompression stops as you ascend. This is another form of diving that is best left to the experts.

How does the bezel operate? Rotate the bezel until the 60-minute pip, arrow, or triangle lines up with the minute hand. The minute hand will then indicate the elapsed time shown on the track on the bezel. You might still be wondering why the bezel only rotates counterclockwise. This is for safety reasons. If the bezel is accidentally knocked and moved, it will only shorten the dive time and not extend it, reducing the risk of being underwater for too long. Now we understand if you’re thinking, “I own dive watches, but I don’t actually dive. Can I use this functionality for something else?” The answer is absolutely!

Essentially, what you have on your wrist is a low-tech, extremely solid, forever reliable chronograph. By lining up the bezel with your minute hand, you basically have a count-up timer. You can use it to time steaks on the barbecue, a parking meter, a race, or even an espresso shot by lining it up with the second hand. After reading all this, we bet you will find more uses for your dive bezel and have even more fun with your watches. The following are four fantastic examples of dive watches that deserve serious consideration in our Windup Watch Shop.

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