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    Re: SOA vs Positions
    From: George Huxtable
    Date: 2009 Nov 9, 00:52 -0000

    I agree with the calculation of 34.8 miles as the distance between the two 
    given positions. What's the problem?
    
    George.
    
    contact George Huxtable, at  george{at}hux.me.uk
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    ----- Original Message ----- 
    From: "Irv Haworth" 
    To: "Navlist" 
    Sent: Sunday, November 08, 2009 11:59 PM
    Subject: [NavList 10508] SOA vs Positions
    
    
    
    Does
    
    The plot thicken ?
    
    Dist.
    
    from
    
    11AM/12.00
    
    Is 34.8NM
    
    Which
    
    =34.8
    
    Seems to indicate positions are in error ?
    
    
    
    
    
    
    
    
    
    Notes
    
    date/time
    
    lat
    
    lon
    
    naut. miles run
    
    SOA
    
    wind from
    
    knots
    
    barom.
    
    wave height
    
    air temp
    
    dew point
    
    water temp
    
    
    2009-Nov-08 16:00
    
    S 44�24'
    
    E 167�00'
    
    43
    
    10.7
    
    220
    
    27
    
    1016.3
    
    1.5
    
    12.0
    
    10.2
    
    13.0
    
    
    2009-Nov-08 12:00
    
    S 44�24'
    
    E 166�00'
    
    35
    
    34.8
    
    220
    
    15
    
    1019.3
    
    0.5
    
    12.0
    
    
    
    2009-Nov-08 11:00
    
    S 44�18'
    
    E 165�12'
    
    290
    
    15.2
    
    250
    
    21
    
    1022.2
    
    13.0
    
    12.7
    
    13.0
    
    
    
    Please excuse my lead-in�it now appears the algorithm used must
    automatically calc. SOA based on Rhumb dist. In this case dist is 34.8 (my
    RL calc) and not 35 NM as NM  Run.
    
    What I am trying to determine : are data generated/reported automatically
    from a GPS  without any inputs from navigator, as well as SOA issue.
    
    ( I have been following the track of a large cruise ship across S. Pacific
    and now wondering what or who does what�with confidence. Reminds me of a
    quip in poor taste �if you drive then drink and face the traffic with
    confidence�).
    
    
    
    
    
    
    
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