Diving watches

[John C. Ratliff]

Okay, now I'm going to ask a diving watch question; do you know why the bazel on a legit diving watch only turns counter-clockwise?

SeaRat

 

[rx7diver]

Okay, now I'm going to ask a diving watch question; do you know why the bazel on a legit diving watch only turns counter-clockwise?

SeaRat

I read (somewhere) a long time ago that it's to prevent it from turning the "wrong" way if it is bumped. No?

rx7diver

 

[Pressurehead]

I read (somewhere) a long time ago that it's to prevent it from turning the "wrong" way if it is bumped. No?

Correct.
To never give you more time but less time if moved.
That's what I was told when I first used one.

 

[Mr.Flash]

this useless for scuba but if you like you can buy a Rolex to diving, just have fun.but just be careful for your buddy may have some idea for you.

 

[scubajosh77]

Here is a few more, old shot.
View attachment 888397

What’s the one with the white face?

 

[Pressurehead]

What’s the one with the white face?

Tauchmeister 1937 1000 Meters.
It's not white it is a light yellow/green colour, and it is a brick heavy.

 

[John C. Ratliff]

Correct.
To never give you more time but less time if moved.
That's what I was told when I first used one.

Just to be clear, the reason a dive watch’s bezel only turns counter-clockwise is because if it’s bumped, and the bezel moves, it will show more bottom time, not less. Bottom time is set from the time you leave the surface, until you leave the bottom to start your ascent. If I started descending at 3:15 PM, and my watch should read 3:33 PM, the bazel time will read 18 minutes. If it is bumped, and moves counter clockwise by five minutes, it will show 23 minutes of bottom time, for calculations for decompression/no decompression limits. That gives a “cushion” of five minutes in the calculation.

If the bezel had moved the clockwise direction, it would show a bottom time of only 13 minutes, giving the false impression that the dive had less bottom time that was actually true.

Let’s say that this dive was to 95 feet depth; we would use 100 feet on the Table 1 dive tables (as shown on my NAUI Dive tables card), which states that I would need to take a 5 minute stop at 15 feet to allow for some decompression. If the bezel had indicated a bottom time of only 13 minutes, it would say I was within the No Decompression Limits (DCLs), and would not need a stop. In actuality, the real bottom time of 18 minutes was still within the NDLs.

So you can see how the dive watch bezel movement only counter-clockwise was a very good safety procedure; it gives a cushion for the calculations of decompression/NDLs. Below are photos of all that is needed for safe diving (computers are nice, but not completely necessary). That Seiko watch has since been replaced by my Citizen dive watch (both were/or solar powered). The Seiko lost its charge, and when I tried to charge it with a light, I got it too close to the watch, inadvertently heated the watch and deformed the “time/date” disc. So it has been replaced now.

Does everyone know about the corrections for the capillary depth gauge, and why it can also be a safety factor in diving?

SeaRat

 

[Pressurehead]

Just to be clear, the reason a dive watch’s bezel only turns counter-clockwise is because if it’s bumped, and the bezel moves,

I was trying to say it show you started the dive earlier and you now have less bottom time.
With tables we used this a lot , set the bezel, signal descent , old habit die hard , I remember the first year with a computer only, [I dived both for a long time,] going for my watch, and it's not there.

I am dyslexic [spelling? As well] , that's my excuse, sorry.

The bezel is not easy to move [on all the good watches, that is ,[ the Omega I have is too easy to move the bezel and I don't like it] I have never had a Seiko change the time on me by moving.

 

[old frogman]

Just to be clear, the reason a dive watch’s bezel only turns counter-clockwise is because if it’s bumped, and the bezel moves, it will show more bottom time, not less. Bottom time is set from the time you leave the surface, until you leave the bottom to start your ascent. If I started descending at 3:15 PM, and my watch should read 3:33 PM, the bazel time will read 18 minutes. If it is bumped, and moves counter clockwise by five minutes, it will show 23 minutes of bottom time, for calculations for decompression/no decompression limits. That gives a “cushion” of five minutes in the calculation.

If the bezel had moved the clockwise direction, it would show a bottom time of only 13 minutes, giving the false impression that the dive had less bottom time that was actually true.

Let’s say that this dive was to 95 feet depth; we would use 100 feet on the Table 1 dive tables (as shown on my NAUI Dive tables card), which states that I would need to take a 5 minute stop at 15 feet to allow for some decompression. If the bezel had indicated a bottom time of only 13 minutes, it would say I was within the No Decompression Limits (DCLs), and would not need a stop. In actuality, the real bottom time of 18 minutes was still within the NDLs.

So you can see how the dive watch bezel movement only counter-clockwise was a very good safety procedure; it gives a cushion for the calculations of decompression/NDLs. Below are photos of all that is needed for safe diving (computers are nice, but not completely necessary). That Seiko watch has since been replaced by my Citizen dive watch (both were/or solar powered). The Seiko lost its charge, and when I tried to charge it with a light, I got it too close to the watch, inadvertently heated the watch and deformed the “time/date” disc. So it has been replaced now.

Does everyone know about the corrections for the capillary depth gauge, and why it can also be a safety factor in diving?

SeaRat

The Tudor Pelagos FDX has a bidirectional bezel and the mins timing marks are graduated in a countdown sequence, in 5 mins increments, from 60min to 0min. I believe that it is a multi-function feature which enables the watch to be used for timing dive duration, underwater navigation legs, time delayed explosive detonation, etc.

Designed by Tudor for French Navy. However, at about $6,000 per watch I wonder if the French Navy has purchased any?

A very cool looking watch.

 

[scubajosh77]

I’ve been looking at the Deep Blue watches. Seem very well made at an exceptional price point. This one has really been speaking to me lately.