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Interesting Find: Auto DST in GW-3000B

6882 Views 22 Replies 13 Participants Last post by  mikenbetts
Found something interesting in my new GW-3000B (Module 5121): at least in the USA, it sets Daylight Savings Time (DST) to "on" when it synchs within the four continental USA time zones.

Here's the situation: I'm in Arizona, where it's MST year-round (except for the Navajos).

1. Set my home city to Denver (DEN).
2. Set DST to off (the indicator says STD, meaning standard time).
3. Returned to normal mode, and everything is kosher.
4. Let the watch synch overnight.
5. Next morning, watch is an hour ahead, and when I display my home time zone, it still shows it as Denver, but with DST "on".
6. Checked the synch indicator, and it says "Y" (Yes, I synched).

So... I figured I made a mistake with the home time zone, so I tried it again. Very carefully following the manual.

Next morning, guess what? Denver is magically set to DST "on" again. Tried this two nights running, with the same results.

The GW-3000B has an undocumented auto-DST feature. Only thing that I could find supporting this in the manual was this cryptic entry: "As of November 2009, China does not use Daylight Savings Time (DST). If China does go to the Daylight Saving Time system in the future, some functions of this watch may no longer operate correctly." In other words, there is an automatic DST setting for certain time zones, and China is not currently one of them (implying that other zones, namely North America and maybe Europe, are).

I'm posting this for the benefit of others in non-DST locations (AZ, IN), who might otherwise be scratching their heads, thinking that they did something wrong by setting their watch to the correct time zone, overriding DST, and then finding the watch an hour off after a successful synch.

Personally, I'd rather Casio left well enough alone, and allowed an override of DST for every time zone, but there you have it. My fix for the thing, of course, is to simply set my home city to LAX for Summer, and DEN for Winter... oh how I wish they had an AZ zone on their watches. ;)
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I just bought a GW3000-BB1 and live in AZ. I spent hours tinkering and searching for info - and only now stumbled on this thread! :-/ I had reached the same conclusion: Module 5121 auto syncs in North America and sets the DST based on the signal. It seems with this watch there is no way to "turn off" DST, which is a little annoying for folks like me in non-DST time zones. Both my Citizen AT Chrono (H610) & my Casio Waveceptor (4717) provide this capability - meaning they are truly set and forget. I love every other aspect of this watch, but I am disappointed that the designers of this module missed this simple, yet very important capability for an "atomic" timepiece.
If you select a Home City, like DEN, which is on the Auto Receive list, the watch will then always sync to the correct time in that Home City as defined by the transmitter, regardless of your DST setting. The DST setting mostly comes into play when you have difficulty in receiving a signal or when the Auto Receive feature is turned off altogether.

In other words, when Auto Receive is successful it will show the correct time of the chosen Home City. You cannot override this by the DST setting to match the time in your city which is different from the Home City.

Does that make sense? See, if you could be allowed to fool around with the auto-sync like that, then that would jeopardize the whole design idea and integrity of a radio-controlled watch.
That surely is one way of looking at this (basically, "it is what it is"). But, it is a perspective that hardly exonerates this watch for being short of capabilities offered by other (older) watches in its same class - by taking control from the user. If this is a new trend in design, I hope is at least a conscious strategy to devalue WWVB-based timepieces in advance of GPS-based ones on the near horizon. Otherwise, I can only consider it a flaw (one I'll be reminded of twice every year I still own it).
1. There is nothing wrong with the watch. A simple workaround solves the problem.
^ This statement alone tells it all. If there was nothing wrong with the watch, then there wouldn't be a problem that requires a simple workaround!

The watch has a design flaw, whether it was a conscious decision or an oversight, 2% of the U.S. are burdened with a diminished user experience (semi-annual workaround). I suppose when one considers the extra cost it must have meant to have a fifth position (DST Off) for the radio control dial, perhaps the potential loss in sales was not substantial enough to justify including it. And in the case of me - this would be true! I bought the watch. But I am wiser now. Pay attention, Casio: I buy watches. Make any more "atomic" watches without this feature and you can count me out.
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@gaijin - I'm sorry that I am being so severe. To your point, the workaround is hardly a big deal at all. It's just that for me the appeal of a G Shock lies largely with function. What ruins it for me is that this limitation - for all the reasons already covered previously - is utterly needless and borders on silly. Just sayin'.
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