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Hi Alan and thanks for your reply. Great customer service from Casio.

As your watch has the "Atomic" feature, basically a regular radio update
from a very precise time source, it is to be expected that it would keep
precise time - as long as it is within radio reception range of the time
signal of course.

I am more interested in the accuracy of quartz watches that do not have this
feature and are left on their own to gain or lose time - hopefully at a very
slow, constant and predictable rate which would turn them into
mini-chronometers usable anywhere in the world, radio reception or not.

I have actually just ordered such a watch - or so I hope - also a Casio
G-Shock, model DW5600E-V1, which is probably the simplest G-Shock available.
I am assured of its sturdiness - there are wonderful videos on YouTube of
the thing being taken out of the freezer, tied to a rotating hand drill to
be slapped repeatedly on a wooden board before being dropped into a boiling
pot of water for 30 seconds. It still worked after that. I am more curious
about its accuracy and predictability and that will take some time to test
and tell. I have a feeling it will not be much better than the little old
strapless 1984 Casio I already have.


-----Original Message-----
From: Alan S
Sent: Wednesday, February 29, 2012 6:58 PM
To: zvidoron@btinternet.com
Subject: [NavList] Re: Gary LaPook's Digital Watch Experiment

Zvi Doron:

On the subject of watch accuracy, I believe I had mentioned this previously,
but for whatever it might be worth, my experience with the Casio G Shock
"Atomic Watch" runs as follows. I'm on the second such watch, sent the first
one back when the resin/plastic band failed after about 5 years of daily
wearing. From conversation I had had with Casio, I expected return of my old
watch, with a new band. They sent me an entirely new watch, and helped me
set it up, as the original one had been.

Respecting each of these watches, checking them against NIST/Naval
Observatory Time on my computer or at the local public library, I can detect
no discrepancy between time shown on the Casio and that obtained from  NIST

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