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This is not quite right, although the rest of RBE's post is
right on. The military receivers that can get the encrypted
(long) word get it over another carrier than that used by
the C/A word decoded by civil receivers. There is no way
for your Walmart gps to use the military code.
During the Gulf War, SA was turned off because the military
had to use civilian receivers. SA was an afterthought,
applied because the civil receivers turned out to work much
better than expected.
On Mon, 24 Jan 2000 19:09:42 -0500, Richard B. Emerson
wrote:
> >
> > I suspect that the military has its own encrypted version
> > of GPS although this is simply a guess on my part.
>
>One of the absurdities of GPS is that during Desert Storm and Panama,
>GPS' selective availability was turned off.  Thus, for a short period,
>the normally encrypted data segment (it's already there and used
>routinely) was available unencrypted.  Consider, too, the error even
>with S/A enabled.  A fuel-air bomb (or ammonium nitrate bomb) could
Rodney Myrvaagnes                   J36 Gjoa
Senior Editor           Electronic Products
My oyster knife is Y2K compliant

   

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