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    Re: Say it aint so......
    From: Peter Fogg
    Date: 2009 Mar 9, 09:42 +1100


    Lu wrote:
     For aircraft navigation, knowing one's position to tenth-mile accuracy is unimportant -- by the time you figure out where you were, you ain't there any more. 
     
    This holds good for practical sea nav too.  Knowing quite precisely where you were is irrelevant while on the move, even if it were possible via cel nav.  What you really want to know, mostly, is the direction to point to get where you are going.
     

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