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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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