GPS altitude

Discussion in 'Gen 1 Prius Plug-in 2012-2015' started by Jerry Liebler, Sep 1, 2014.

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  1. GregP507

    GregP507 Senior Member

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    You didn't read far enough: "you can count on your error excursions to be much greater than the above numbers."
     
    #21 GregP507, Sep 2, 2014
  2. CharlesH

    CharlesH CA HOV Decal #5 on former PiP

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    The story I heard on this point was that devices with the secure "selective availability" override were in short supply, so they had to provide soldiers with standard commercial GPS devices. So they had to turn off the selective availability. :rolleyes:
     
    #22 CharlesH, Sep 3, 2014
  3. Rebound

    Rebound Senior Member

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    Not sure that matters when it matters most: When landing.
     
    #23 Rebound, Sep 3, 2014
  4. ftl

    ftl Explicator

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    The first Gulf war was over long before SA was removed. It was actually a policy decision made by Bill Clinton in 2000:

    GPS.gov: Selective Availability

    "In May 2000, at the direction of President Bill Clinton, the U.S government discontinued its use of Selective Availability in order to make GPS more responsive to civil and commercial users worldwide."
     
    #24 ftl, Sep 3, 2014
  5. Jerry Liebler

    Jerry Liebler Member

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    TomTom, portable GPS car navigation systems
    A quote from the above: "Then during the Gulf War the US military needed many more GPS receivers than it had. It solved the problem by using civilian GPS receivers. But to increase the accuracy of these devices, the SA function had to be temporarily disabled. Then in 2000, US President Clinton announced that SA would be disabled completely. Because US government ‘threat assessments’ concluded that removing SA would have minimal impact on national security. Though in the same speech he said the US would still be able to ‘selectively deny’ GPS signals on a regional basis when national security was threatened."

    Not that any of this maters, It's fun to use the "discovery" that my PIP can tell altitude with whatever limits there are on it.
     
    #25 Jerry Liebler, Sep 4, 2014
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