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    Navigation formula problem
    From: Sam Critchley
    Date: 2004 Oct 19, 18:30 +0200

    Hi,
    
    I'm currently trying to debug a formula which does the following:
    
    Input
    -----
    - Position A latitude
    - Position A longitude
    - Position B bearing from Position A (Azimuth)
    - Position B distance from Position A
    
    Output
    ------
    - Position B latitude
    - Position B longitude
    
    You can check out the formula(e) in a spreadsheet at:
    
    http://www.cowcam.com/navigation/PointBposn.xls
    - Fill in the "Input" in the green cells and you should get "Output" in the lilac ones
    
    However, this doesn't match against the following known information (at least 
    according to my GPS and combined with some Great Circle PHP scripting):
    
    The boat is located at +52.371987 lat, +4.882612 long
    The Rijksmuseum at +52.362108 lat, +4.883987 long
    The distance from the boat to the Rijksmusem is calculated as 0.68456 km
    The bearing from the boat to the Rijksmuseum is calculated as 175.13 deg
    The bearing from the Rijksmuseum to the boat is calculated as 355.13 deg
    
    I've been playing with the sheet for ages now and can't seem to get it to what the GPS says.
    
    Anyone got any ideas? I'd really appreciate it if you do...
    
    Thanks in advance,
    
    Sam
    
    
    
    --
    Sam Critchley
    Sam.Critchley{at}dial.pipex.com
    ***
    A2B - the new location-based search engine.
    See http://www.a2b.cc for details. Great for GPSers!
    ***
    
    
    

       
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