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On Mon, 18 Apr 2005, Lu Abel wrote:

>I don't know about watches, but there are certainly a lot of clocks (and
>some pretty small ones, too) that synchronize themselves to WWV.  They
>are available everywhere from Sharper Image to Radio Shack.  When I
>taught USPS's celestial course and started talking about time sources,
>the next week three or four of my students showed up with examples of
>these clocks because I hadn't mentioned them.   Some of them are very
>inexpensive (30~50 USD), way less than the cost of a decent shortwave
>receiver capable of receiving WWV or CHU.
>
>The synchronization signals are actually provided by WWVB, a very low
>frequency companion to  WWV.   According to the WWV web site, WWVB
>provides coverage for the contiguous 48 states (and therefore probably
>also for southern Canada)

The siganl even reaches the Maritimes -- received well in N.B.

>To the best of my knowledge, though, there's no way one can determine
>time zone (or even summer (daylight) vs winter (standard) time) simply
>from the WWVB signal.

The WWVB signal uses a code which includes bits for indicating DST.
See  for more
information.

-- Richard Langley

>If the Swatch watch was changing time zones, it
>must have some additional geographic-location-determining device.
>
>Lu Abel
>
>Manson, John wrote:
>> Now there is a toy I have to have....off to the www to get details
>> John
>>
>> -----Original Message-----
>> From: Navigation Mailing List
>> [mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM] On Behalf Of Dan Allen
>> Sent: Monday, April 18, 2005 8:55 AM
>> To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
>> Subject: Re: Cell phone time, etc
>>
>>
>> On Apr 15, 2005, at 11:50 PM, Frank R wrote:
>>
>>
>>>That is, do you get time zone changes as you drive along a highway?
>>
>>
>> Yes I do, that is why I found it curious that I did not get DST updates
>> without turning the phone on and off.
>>
>> Now I have a new toy: a Swatch watch which automatically tracks WWV
>> stations and other unspecified satellite or cell tower sources to handle
>> DST, time zones, and so forth.  It did not work too well as I crossed
>> America by air yesterday until right before I landed - then the time
>> zone changed from Eastern to Mountain.  I need more technical details
>> about how it obtains position information (no GPS in it).
>>
>> Dan
>


===============================================================================
 Richard B. Langley                            E-mail: lang@unb.ca
 Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/
 Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142
 University of New Brunswick                   Fax:      +1 506 453-4943
 Fredericton, N.B., Canada  E3B 5A3
     Fredericton?  Where's that?  See: http://www.city.fredericton.nb.ca/
===============================================================================

   

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