this post was submitted on 06 Oct 2024
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Fucking Time Propagation (lemm.ee)
submitted 1 month ago* (last edited 1 month ago) by [email protected] to c/[email protected]
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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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[–] [email protected] 2 points 1 month ago

To determine how long the signal took to arrive you would need to know the exact distance it traveled and its propagation speed.

I posted this elsewhere in this thread but you don't actually need to know the distance if you do some clever stuff. Like NTP does. Dr Julian explains it pretty well in this video.