Most useful complication...for you...

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My favorite complication: no complication.

I prefer my watches clean and simple
 
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A useful complication for me is the fractional seconds hand on my Swatch chronograph. I service and re-spring a lot of 400-day clocks. After replacing the suspension spring on these, regulating them to time can take days. Only to end up finding the suspension spring is too weak (runs too slow to regulate), or too strong (runs too fast to regulate). Once the clock is running, I start the stopwatch at the beginning of a swing. Count ONE and the end of the first swing, repeat until I count 8 (or 10), then stop the chronograph. The fractional seconds hand will tell me immediately if the clock is fast or slow. I can usually get these clocks to run within + or - 3 minutes per day, right off the bench. I also use a WWII Elgin “jitterbug” timer for this purpose. The centre sweep seconds hand goes around the dial 6 times in one minute. This also works well.
 
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1. Date
2. Dive bezel to time everyday life things
 
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Bezels ain’t complications, y’all - unless it’s a Breitling, in which case it is complicated
 
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Looking around some time ago, I read that moon phase were considered useful to those needing to track tides? Sailors, fishermen, beach combers?

I’m such a dunce about tides/open waters that I can’t even decipher whether that was ever actually useful (or if there’s anyone who may still use the feature)?

You would need more than a moon phase to track tides. The only mechanical tide timing watch I know of is the Heuer Solunar line...
 
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Day-date and power reserve indicator are the most useful for me.
I like dive watches and those two functions do not show there so often 😁
Edited:
 
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The triple date ... for me.

Now you’ve jumped the shark! 😁

Forgetting the month what I have to look forward to as I age? 🙁
 
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I'll time cooking with a chronograph, since it's usually easier to just snap the buttons for a <10min interval than to get out the phone and set it. I don't cook anything often enough to require an actual kitchen timer though so

I'll also use the GMT, but like I said in the other thread that's a bit more for fun than it is for actual use.

Least useful complication....

date
 
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Bezels ain’t complications, y’all - unless it’s a Breitling, in which case it is complicated
I never said it was, i said for timing purpose i prefer the bezel, implying that a chronograph complication is not necessary for me.
Neither is lume a complication 😀👍
 
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I never said it was, i said for timing purpose i prefer the bezel, implying that a chronograph complication is not necessary for me.
Neither is lume a complication 😀👍

Sorry, mate - wasn’t intended to reply to you (see a few others in the chain), and was really just looking to tee up a dig on Breitling!
Edited:
 
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Most useful for me is the date (all my watches have it), followed by a chronograph to time experiments in the lab, at least when I still worked in the lab more than I do now. By far and away the least useful complication, which two of my mechanicals have, is the day of the week indicator - I hope I never reach the point where I need my watch to figure that out!
 
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I'm still trying to figure out what the 3 hands on my constellation are for.

I sometimes strap on my watch without winding it for half a day or a whole day.

😀
 
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I sometimes strap on my watch without winding it for half a day or a whole day.

😀

nor if you’re my wife, half or a whole year...
 
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I feel like a child, checking to see if the parent asking the question has their hand in slap-ready mode...

Wondering what complication you own that you find is the most useful?
GMT, yeah, definitely GMT is the complication I find most useful.

Why? "Cuz math"... obviously.


Oh, and the Explorer II is the best GMT, because it can go underwater too...

Why? Cuz screw-down crown... obviously. 😎
 
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I feel like a child, checking to see if the parent asking the question has their hand in slap-ready mode...

There is no wrong answer here...at least as far as I'm concerned. 👍
 
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I should add that although a date function is my complication of choice, I don’t want it with a cyclops which, so far as I’m concerned, ruins the entire aesthetic of the dial. Another reason that I’m an Omega man and not a Rolex fan boy.
 
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Chronograph. It begins with timing the cooking of my hot cereal in the morning (usually grits) as well as when I am flying and I line up on the runway before taking off (private pilot). It serves as the back up in case of electrical failure in the plane.