You’re in the shallows, your brain works again, and you count down five minutes. So when you reach three meters, you turn the bezel counterclockwise until the reference marker is at the minute hand and check for five minutes. And it is always a good idea to finish each dive with a safety stop of five minutes at three meters.
The dive time from the bottom to the surface is already considered decompression time. One more aspect of using the watch as a no-decompression dive timer: the dive time starts at the surface but finishes in the depths when beginning the ascent. All calculations have been done and checked before the dive. This way, divers only have to keep the marker in mind and no confusing numbers. At which point, the diver must begin ascent. To set up the watch, experienced divers subtract 36 from 60, setting the minute hand to 24, which now counts down 36 dive minutes until it reaches the 60-minute mark. The no-decompression time is 36 minutes according to the 90s rule, which would call for a twin ten-liter tank of air. Now, let’s say the bottom of the wreck is at 27 meters. Experienced divers know that if something can happen, something will happen. They also calculate the necessary air supply and whether it will be enough for that dive, including a safety margin of one-third more. Setting dive bottom time using the bezel’s reference marker I’ll follow up on really deep diving with a mechanical watch in a future article. That’s 40 minutes of no-decompression time at 25 meters.Īt 30 meters it’s 30 minutes, at 40 meters 10, and unfortunately at 50 meters the formula no longer works, necessitating tables. Here is an example using a maximum depth of 25 meters: doubled makes 50, subtracted from 90 gives you 40. If you double the maximum depth and subtract the result from 90 you get your no-decompression time. But decompression tables were quickly developed to check no-decompression time – the time when a diver should resurface without having to make a decompression stop under water.Įxperienced divers (especially those who weren’t too excited about all these numbers) devised an easy rule to calculate decompression time in the head: the 90s rule. In the early 1950s there was no instrument available to calculate decompression times. See Roger Dubuis watches on Amazon here.Setting dive time using the bezel’s reference markerīut how does the diver know when to end the dive? Until then, I will appreciate them from afar. Overall my appreciation for these watches is high as a high-end watch that can be worn everyday for those who can afford it. All the watches are pricey, but you get a great watch and luxury toy to tote around. One thing I just don’t get is the odd large branding of “k10” and “Sports Activity Watch.” Why is this at all necessary? “Sports Activity Watch” is about the cheesiest thing a luxury watch company could place on the face of a watch that is easily $8,000. The red number indexes are charming, and nicely compliments the red trim on the case underneath the bezel. My favorite model is the k10, as it is the most traditional diver of all the models I have seen, though it does not have a seconds hand. The strap deployments are branded nicely with an “RG” and “Easy Diver” in nice relief on the clasp. All models that I have seen have a see through caseback to the nicely decorated movements. Most of the models are automatics, but the tourbillon and chronograph models are manually wound. I love looking at these watch hands, though I am less impressed by the hands on the chronograph model. Very powerful looking in an almost aristocratic manner. These hands are like sharp blades cutting through time. the easy diver line always delights me with the smooth lines of its face, and some of the boldest watch hands I have ever seen on a dial. It is a bit over the top, but the whole point is instill the sense of ruggedness, which also applies to the large crown and retaining bar in the middle on the strap connection between the lugs.įrom complex tourbillons, to unorthodox square models. The bezel is a distinct point of interest, almost cartoon looking in its boldness. The large screws in the lugs that secure the strap, the carbon fiber accents and dial in certain models, and the oversize crown are all contemporary touches in an otherwise classic looking dive watch. Other elements of the watch are far more modern in comparison. Affiliation to what I am not sure, but regardless the effect is nice on the eyes. Seeing it brings recollection of antique emblems, shields, or heralds. The flared edges near the lugs present a visual attraction that is difficult to explain. The shape of the Easy Diver case is very unique in my opinion.
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