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Casio GW-M5610U

📅 2022-Jul-09 ⬩ ✍️ Ashwin Nanjappa ⬩ 🏷️ casio, wristwatch ⬩ 📚 Archive

The Casio GW-M5610U (also called GW-M5610U-1) is a digital G-Shock watch that charges using sunlight and keeps precise time by syncing with atomic clock radio calibration signals.

I like attending work meetings on time and started looking for a wristwatch that could maintain precision in time. To my surprise, I discovered that all digital/quartz wristwatches deviate by a few seconds within a month. Mechanical watches are worse (even million dollar ones) - deviate by seconds within a day!

The only precise solutions turned out to be smart watches (that sync with NTP servers over the internet) or digital watches that sync to the atomic clock radio signals that are transmitted on most continents. Needless to say that I preferred the radio sync - anything to avoid the complexity of smartwatches and their poor battery performance. I asked the friendly folks on WatchCrunch for a recommendation and the answer was GW-M5610.

I went to order the GW-M5610 (usually named GW-M5610-1 on sites) and found that it had been recently updated to GW-M5610U with an updated module and other features. And that is how I ended up with this gem.



The user guide calls the 4 buttons A-D, but I will be referring to them using their position on the watch since that is unambiguously easier:



© 2022 Ashwin Nanjappa • All writing under CC BY-SA license • 🐘 • 📧