I’ve created a very simple Google Map page to indicate the nominal ranges of the following atomic clock transmitters:
- MSF (UK)
- WWVB (USA)
- DCF77 (Germany)
- JJY おおたかどや山標準電波送信所 (Japan)
- JJY はがね山標準電波送信所 (Japan)
- BPM (China)
The indicated ranges are those given by Casio.
Atomic Sync Range Map
Update: Added BPM China.
The G-Shock Hacker’s Handbook is now up to version 0.7, and 37 pages.
Do you know what the hardest part of writing and editing this book is? The index. I would never have believed just how hard it is to come up with a sensible, consistent indexing policy. Does “Phillips screwdriver” come under “screwdriver, Phillips”, and does “screwdriver” itself come under “tools”? How about “screwback case opener”? I can think of several different categorizations for that one!
I think I’ve got a reasonable policy together now, but it’s amazing how some concepts force me to rethink everything all over again.

I’ve started a new project to produce a book on hacking G-Shock watches.
The project site can be found at: gshockbook.co.uk.
OK, disclaimer first: this article is for educational purposes only. I absolutely do not recommend that you perform this procedure yourself. If your bezel needs to be tightened, I advise you to take your watch to an official Breitling service center.
But there may come a time when you really need to fix the bezel, and you’re thousands of miles from civilization. So here’s how to do it…
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