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Asking how well a watch can keep the time is anal retentive ? Wow, just wow.

Anyway, the idea of the question was literally to discuss it, out of curiosity, this is a forum after all. And as we all know, apple goes into great detail sometimes, whether it really matters or not.

Besides, you just know someone is going to leave an apple watch in a draw for 6 months and then let the whole world know how inaccurate the apple watch is and make headlines. Bad news sells, especially when apple is involved.

How? The watch will be dead in under a week.
 
The most accurate currently available Quartz watches use Thermocompensated movements these are only found on expensive high end watches such as Breitling and are usually certified to 20 seconds a year so your $20 Casio ain't gonna come close to this type of accuracy
The :apple: watch will probably be bang on after a few days of not being synced which is good enough
 
The most accurate currently available Quartz watches use Thermocompensated movements these are only found on expensive high end watches such as Breitling and are usually certified to 20 seconds a year so your $20 Casio ain't gonna come close to this type of accuracy
The :apple: watch will probably be bang on after a few days of not being synced which is good enough

20 seconds a year? Lol!!!
Did you mean to say milliseconds???? That's not even vaguely accurate.
I built a digital clock in high school with a 555 timer and a two cent resistor that was more accurate than that. If you believe that the MOST accurate watches in the world lose 20 seconds a year, I'd love to see the link.
 
The amount of negativity, borderline profanities, personal insults and simply off-topic responses on these forums is beyond comprehension sometimes.

There are a few posters here who constantly act rude and put down other people's posts. If they keep it up, they'll likely find themselves banned. They will not be missed.

How well does the watch keep track of time when disconnected from iPhone/Internet/NTP? Does the watch use a real-time operating system and/or a fixed clock-rate processor?

This is a legitimate question (and it's been asked before).

For short answer, I'll just point you at this blog from the Apple Watch Camp:

How Apple Watch achieves its timekeeping accuracy

As the author notes, iPhones and iPads can be off up to 10 seconds a day if they're unable to sync up with a time source, although usually it's under a couple of seconds.

So let's say you went on a camping trip in the woods without your phone, but you did bring a charging source for your Watch. With luck, even after a couple of weeks, you'd still be less than a half minute off.

Of course, as someone else pointed out, the moment your watch goes dead, then without its host phone to sync to, you're out of luck even if you charge it again. It's going to reset itself to something silly like 1970 and it's useless at that point.

(This is why some prefer a simpler watch+notifications combo like the Martian Notifier. Its quartz clock runs on its own battery for two years, so the watch part still works even though the notifications/voice side dies after five days.)
 
20 seconds a year? Lol!!!
Did you mean to say milliseconds???? That's not even vaguely accurate.
I built a digital clock in high school with a 555 timer and a two cent resistor that was more accurate than that. If you believe that the MOST accurate watches in the world lose 20 seconds a year, I'd love to see the link.

Look HERE And HERE

Thermo compensated quartz movements, even in wrist watches, can be accurate to within ± 5 to ± 25 seconds per year and can be used as marine chronometers to determine longitude by means of celestial navigation.[5][6][7]
 
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Look HERE And HERE

Thermo compensated quartz movements, even in wrist watches, can be accurate to within ± 5 to ± 25 seconds per year and can be used as marine chronometers to determine longitude by means of celestial navigation.[5][6][7]

Thanks for the info.
Dang.... I'm incredulous! I'm sooooo grateful Apple Watch is NOT mechanical.
 
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