OK, I'll bite.
Maybe I don't understand your point, but how is a watch going to keep you alive? What are you expecting the watch to do that a dive computer doesn't "perform"? Do you really plan and execute dives by guessing the depth, and figuring out how much gas you have left based on a precise measurement of the dive time?
I mean, don't get me wrong. It's fun to wear a dive watch to signify that you are part of the tribe, and some of the watches that people have mentioned here are really cool. But I'll trust a $160 Mares Puck over an $8,000 Rolex Submariner when it comes to keeping me alive.
These dives would be 30 feet deep max. Deco is not a problem. Running out of gas would be (it's a cave). I can look at the SPGs but I also want to see the time as it is easier to look at ones arm than to look at an SPG under ones arm. A watch would be visible 100% of the time while an SPG is only visible when you remember to look at it.
I have a dive computer with a black and white (grey) LCD screen. The backlight is tricky to turn on and only lasts for 30 seconds. I need something more usable. Because of back scater I need something self-illuminating. Else I will only see some silt. I could solve this issue by purchasing an USD 800 dive computer with an LCD or OLED screen but they cost too much. A dive watch would be self-illuminating, cheap, and within view.
Some answers:
1) how is a watch going to keep you alive? Time = gas constantly visible (known depth). Cannot forget to check the SPG.
2) What are you expecting the watch to do that a dive computer doesn't "perform"? Self illuminating while beeing "cheap".
3) Do you really plan and execute dives by guessing the depth, and figuring out how much gas you have left based on a precise measurement of the dive time? No, I do have SPGs but knowing the dive time at any instant would really help staying aware.
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