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    Re: SOA vs SMG or SOG
    From: Joe Schultz
    Date: 2009 Oct 22, 23:22 -0700

    Hi Irvin,
    You may be interpreting what you see on www.sailwx.info as vessel data.  Looks 
    to me like they're calculating from vessel submitted messages into a 
    "readable" format.  Perhaps SOA was used by the website to differentiate from 
    the reporting format that the vessel used.
    If you go to http://www.vos.noaa.gov/vos_scheme.shtml then on the left side is 
    a PDF file called Observing Handbook No. 1.  This explains the standard 
    format for weather messages sent to the U.S., among other good things (but I 
    wouldn't trust their distance-to-the-horizon table).  The handbook has Course 
    Made Good (CMG) and Speed Made Good (SMG) for the past THREE hours as 
    reporting elements.  Nautical miles run is not an element.
    Good cloud and sea photos in that handbook, and a few weather rhymes to boot.
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