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    Re: Timekeeping and sight time records
    From: Fred Hebard
    Date: 2005 Mar 17, 14:58 -0500

    Victor,
    
    We're all delighted when these cans get opened!  Usually, the more
    worms, the better.  Hope you have a good trip.
    
    Fred
    
    On Mar 17, 2005, at 2:43 PM, Victor Garand wrote:
    
    > Thanks Fred.
    >
    > I apologize again for having apparently opened a can of worms with a
    > simple
    > question. Since I will be away for some time, I look forward to
    > rejoining
    > the list when I return.
    >
    >
    > ----- Original Message -----
    > From: "Fred Hebard" 
    > To: 
    > Sent: Thursday, March 17, 2005 11:52 AM
    > Subject: Re: Timekeeping and sight time records
    >
    >
    >> The prospect of global shutdown of UPS is one of the few rationales
    >> for
    >> celestial nav, so don't ruin our excuses too thoroughly in the name of
    >> truth :).  Also, GPS satellites could be targeted during war.
    >>
    >> It's important to remember the difference between GPS time and UT1,
    >> and
    >> to be careful about which time is displayed on the unit.  Especially
    >> if
    >> that were switchable by the user, it could lead to errors during times
    >> of stress.
    >>
    >> Fred
    >>
    >> On Mar 17, 2005, at 12:52 PM, Richard Langley wrote:
    >>
    >>> 1) DoD cannot make the decision by themselves. It would have to come
    >>> from the
    >>> White House. And any such decision is highly unlikely. Even during
    >>> 9/11, GPS
    >>> was not shut down. Futhermore, with localized jamming capability, it
    >>> could be
    >>> argued that there is no real need for a global shutdown anyway.
    >>> 2) Use of GPS for setting a time piece that would be used as a time
    >>> reference
    >>> for celestial observations seems to me to be quite valid.
    >>> -- Richard Langley
    >>>    Professor of Geodesy and Precision Navigation
    >>>    and Contributing Editor, GPS World Magazine
    >>>
    >>> On Thu, 17 Mar 2005, Victor Garand wrote:
    >>>
    >>>> Richard,
    >>>>
    >>>> Dual use applies to many facilities but it should not be confused
    >>>> with dual
    >>>> control particularly where national defence is concerned. The bottom
    >>>> line,
    >>>> as we have all been reminded is that national security trumps ALL.
    >>>>
    >>>> In any case, it seems to me that the only legitimate introduction of
    >>>> GPS on
    >>>> this particular List is its use as a training aid (check) in
    >>>> developing
    >>>> proficiency in the area of celestial navigation.
    >>>>
    >>>> Vic
    >>>>
    >>>>
    >>>> ----- Original Message -----
    >>>> From: "Richard Langley" 
    >>>> To: 
    >>>> Sent: Thursday, March 17, 2005 7:58 AM
    >>>> Subject: Re: Timekeeping and sight time records
    >>>>
    >>>>
    >>>>> On Thu, 17 Mar 2005, Victor Garand wrote:
    >>>>>
    >>>>>> By the way, if you need an excuse to spend time on the subject of
    >>>>>> celestial
    >>>>>> navigation, don't forget that the GPS network is a DoD facility. I
    >>>>>> understand that general access is officially at the discretion of
    >>>>>> DoD
    >>>>>> (national emergencies etc. could change the situation).
    >>>>>
    >>>>> Not correct. GPS is officially a dual-use system. See
    >>>>> >>>> FactSheetSPACE-BASEDPOSITIONINGNAVIGATIONTIMING.pdf>.
    >>>>>
    >>>>> -- Richard Langley
    >>>>>
    >>>>> ===================================================================
    >>>>> ==
    >>>>> ==========
    >>>>> 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/
    >>>>> ===================================================================
    >>>>> ==
    >>>>> ==========
    >>>>>
    >>>>
    >>>
    >>>
    >>> =====================================================================
    >>> ==
    >>> ========
    >>>  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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