I wanted to get a thread going on accuracy. This is a simple test and I wanted to see what others are getting.

I received my watch( 2016 Planet Ocean GMT) a few months ago. It has not been run down since. I set it against time.gov to the second. I am getting a about +3-4 seconds a day.

What are you all getting?

 

Seems the Atomic clock is running slow again these days! Don't worry, Government engineers will make the necessary adjustments before the year ends.

 

Mechanical watches are "iffy" things, usually very position sensitive. My Speedmaster (NOT chronometer certified) runs +3-5 a day when worn, a bit more when kept wound in my watch box face up. My Seamaster (COSC & METAS certified) runs +5 a day when worn, haven't checked it otherwise. I use the NIST Time Widget as a reference. I think most here will relate similar results. You can make yourself crazy tracking mechanical watch accuracy. My 262mhz (a temperature compensated quartz) Bulova Lunar Pilot looses about 1 second in 3 months, worn or unworn. I will undoubtedly compound the craziness by buying a Timegrapher. I think you are getting excellent accuracy from your PO, try to just relax and enjoy it!

 

https://www.nist.gov/news-events/news/2019/07/nists-quantum-logic-clock-returns-top-performance

I like the compactness of my 2018 Diver 300M compared to NIST’s quantum logic clock. Just can’t envision a proper strap for it.

 

I predict that the atomic clock will win.

 

Meh. If you're going to spend the big bucks on a quantum logic clock, may as well invest in a bracelet.

My concern is with resale -- quick perusal of the usual sites suggest that you're losing a good chunk of that ion-trap lattice clock's value the second you leave the laboratory.

 

Depends of the criteria. If it is accuracy only, then atomic clock wins. If it is wearability, then... well... I don't see me wearing an atomic clock on my wrist

 

My SMPO Chrono, which is COSC gets +2 day in and day out. My Speedmaster '57 gets -4 day in and day out. All against a GPS source.

 

An atomic clock must be viewed in reality, not down the internet. The internet will distort the reality.
Equivalent to viewing an artwork through the internet, just not the same as reality.

Since the new PO is on your wrist, it is the reality.

 

All PO’s are COSC, newer ones are METAS.

 

Even a cheap quartz watch would be more accurate than most mechanical watches.

 

My Ti Planet Ocean 9300 has gained 50 seconds in the past 28 days (but 20 of those seconds were in just the last 10 days). So it's running between 1.6 sec/day to 2.0 sec/day, averaging +1.8 sec/day.

During the same past 4 weeks, I did wear my Rolex ceramic Pepsi GMT II for 3.5 days at the beginning of November, and it only lost 0.3 sec total during that time.