Re: NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2004127

From: Sam Wormley (swormley1_at_mchsi.com)
Date: 11/25/04 

Date: Thu, 25 Nov 2004 23:55:41 GMT

Norman wrote:
> On Thu, 25 Nov 2004 17:09:02 +0100, "Sebastian 'Wastl' Koopmann"
> <Wastl.K@GMX.de> wrote:
>
>
>>Norman <ihatespam@nospam.com> schrubte:
>>
>>
>>>>>Why do you keep posting this information Sam?
>>>
>>>>Because many people read it?
>>>
>>>Yes but which people understand it?
>>>Not everyone is as clever as Sam
>>
>>The essential information is clearly simple to read: Sat PRNx
>>was/is/will be off air for time x - y. That's not *so* complicated :) It
>>gives GPS-Users the ability to check what condition the can look for
>>when using their GPS. Or they can feed planning software with this
>>information ...
>>
>>
>>Wastl
>
> And after looking at the data with their GPS in their hand, what do
> they do next assuming they know what:
> 2004121 171458Z NOV 2004 24 FCSTDV 328/1600-329/1600
> 2004122 191555Z NOV 2004 01 FCSTSUMM 323/1645-324/1600
> 2004124 222345Z NOV 2004 29 FCSTDV 335/0500-335/1700
> 2004125 240817Z NOV 2004 24 FCSTSUMM 328/1620-329/0808
> 2004126 241522Z NOV 2004 02 FCSTDV 336/1830-339/1830
> 2004127 242117Z NOV 2004 29 FCSTCANC 335/0500-/
> etc means. (Presumably periods of inactivtiy by the above satellites
> on certain dates/times)
> If it was weather data you could elect to sit with your feet up by the
> fire and read a book if the data indicated approaching inclement
> weather. As it is, my GPS (Garmin 12XL and Garmin V) will continue
> operating during those above periods with no apparent loss of accuracy
> that I will be aware of. In addition my GPS receivers do not have any
> means of adjustment to make use of the above information. So the whole
> excercise must be one of the USAF generating data to correspond with
> their periods of maintenance but with no particular end user in mind.
>
> An analogy would be:
> If a store keeper puts a sign in his window indicating his store will
> be closed from the 1 December 2004 to 5 December 2004 one would think
> his store would not be open for business between those dates. If you
> went to the store and saw the store keeper serving customers during
> those periods and you went in and bought something surely you would
> question the validity of the notice in the window. Or perhaps you
> could say "Nice notice Bill please keep putting it up we all love it
> but take no notice of it as we can all come in and get our goods just
> the same"
>
> Sorry to be like a dog with a bone but I have been intrigued by this
> info appearing in the newsgroup for a long while and not receiving
> much in the way of queries. I thought it was time I asked a few
> questions.
> I have asked them and now as far as I am concerned the matter is
> closed with apologies to Sam for any inconvenience.
>
> Norman
>
>

   The folks effected most are professional users of GPS, where
   an occasional surprise outage or scheduled downtime may possible
   limit the integrity of data.

   Many will argue that professionals, who need knowledge of current
   constellation status and planned interruptions of individual
   satellites have resources independent of reading a USENET Newsgroup
   for this information.

   I, for one, do studies of error sources, and attempt to keep track
   of cause and effect--including how the current constellation
   influences accuracy measurements. Because I monitor this information
   why not share it with others. Hopefully some of my technical posts
   are of assistance to others.

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