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    Re: Cell phone time, etc
    From: Richard B. Langley
    Date: 2005 Apr 18, 12:20 -0300

    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{at}LISTSERV.WEBKAHUNA.COM] On Behalf Of Dan Allen
    >> Sent: Monday, April 18, 2005 8:55 AM
    >> To: NAVIGATION-L{at}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---.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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