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Philip, I agree with your thought that one mile accuracy is adequate for
off-shore passagemaking, but I can only imagine that from your comment of
accuracy of 30 meters or less being unnecessary, that you don't fish.
Will Martin
At 12:57 AM 5/3/00 +0200, you wrote:
>For maritime users in small craft a GPS accuracy of 100 metres is more than
>sufficient.   Provided you can find the fairway or safe water buoy at the
>approaches to ones destination or the entrance to the harbour, it is far
safer
>to navigate by sight (i.e. pilotage) rather than by 'head-down' reference
to the
>GPS.
>
>Out at sea an accuracy of one mile is quite sufficient.
>
>There are occasions when a greater accuracy would be useful such as an anchor
>position in a crowded anchorage.    There is no real need to know the boat's
>position to an accuracy of 30 metres or less.
>
>Philip Ouvry
>

   

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