clifto wrote:
> News wrote:
>
>>clifto wrote:
>>
>>>Kurt wrote:
>>>
>>>
>>>>"Richard B. Gilbert" <rgilbert88@comcast.net> wrote:
>>>>
>>>>
>>>>>GPS, or at least the civilian version of it, is only accurate to within
>>>>>about 300 feet or 100 meters.
>>>>
>>>>It's been changed for a few years, now more like 15 meters. Clinton was
>>>>the one that changed that.
>>>
>>>
>>>http://www.navcen.uscg.gov/faq/gpsfaq.htm#Standard
>>>
>>>SPS provides accuracy's of (for position, the accuracy with respect to
>>>geographic, or geodetic coordinates of the Earth) within:
>>>100 meters (2 drms) horizontal 156 meters (2 Sigma) vertical 300 meters
>>>(99.99% prob.) horizontal 340 nanoseconds time (95% prob.)
>>
>>"What is the status of Selective Availability (SA)?
>
>
> What does SA have to do with the 2008 accuracy specification I posted?
>

IIRC, SA encrypted the low order bits in order to prevent GPS being used
for weapons targeting and other anti-social behavior.