Watches

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Fucking Time Propagation (lemm.ee)

submitted 9 months ago* (last edited 9 months ago) by pineapplelover@lemm.ee to c/watches@lemmy.ml

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Just bought the GWM 5610U-1C. It was a tough decision choosing between the DW5600 and this, ended up choosing this because the atomic time keeping is cool.

However, I'm a tad annoyed that the time doesn't perfectly match with time.gov and time.is since the atomic sync doesn't account for time propagation, so there's like a fraction of a second delay that's noticeable. Other than that, the watch is fantastic and has most features I would want. (I wish it had barometer and altimeter stuff, maybe even compass, and dive rated so I can press buttons underwater)

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[–] pineapplelover@lemm.ee 2 points 9 months ago (1 children)

Yeah from my napkin calculations from distance from colorado to los angeles, I would get a time delay of 0.0045 seconds using the speed of light. But let's say for the sake of interference and curvature of the earth stuff, we double that number, you would get 0.009. With that number, I still won't notice that delay by much. So I wonder why I'm getting like 0.25 seconds of delay which is a significantly large number. It makes me want to get several atomic clock devices to see if it's an issue with the watch or my environment. I doubt the watch is the issue though since I trust Casio's QC is very good, so it must be my setup.

[–] Curious_Canid@lemmy.ca 2 points 9 months ago

That is a much larger delay than I would expect too. I can see why you're curious.