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    Re: GPS selective availiability 'switched off'
    From: Rodney Myrvaagnes
    Date: 2000 May 04, 23:50 EDT

    All points well taken except 3. Some of us cruise in places where the buoys 
    are few but the pbstructions are quite permanent, like
    eastern Maine. There was no point in surveying one's own chart corrections 
    before, but now a few dinghy trips may open small
    passages for the mother vessel at high tide.
    I still wouldn't bet my boat on a chart I hadn't verified, but I will get some 
    satisfaction out of pinning some things down for myself. I
    expect to compare two GPS receivers with and without DBR corrections (plain 
    vanilla CG beacons) this season and see if I can
    develop confidence.
    I will also look at the web site Prof Langley posted, if it doesn't crash the 
    IE on this portable. I can look at it tomorrow with netscape
    if it does.
    On Thu, 4 May 2000 23:15:31 +0100, Clive Sutherland wrote:
    >POINT 3
    >What is the point of knowing your position in Lat and Long more
    >than the quality of the Chart or Map you are using. Sandbanks, mudflats
    >and estuary bars as well as navigation buoys are known to move about.
    >POINT 4
    Rodney Myrvaagnes                   J36 Gjo/a
    Senior Editor           Electronic Products
    My oyster knife is Y2K compliant

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