NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Timekeeping and sight time records
From: Richard B. Langley
Date: 2005 Mar 17, 13:52 -0400
From: Richard B. Langley
Date: 2005 Mar 17, 13:52 -0400
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/ ===============================================================================