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    Re: SOA vs SMG or SOG
    From: Irv Haworth
    Date: 2009 Oct 23, 10:29 -0700

    Thanks you JOE
    Much appreciated. I had looked , all too briefly at the WX book but
    obviously missed the section on speed. Hopefully Jeremy will add a comment
    or two as well as George !
    -----Original Message-----
    From: navlist@fer3.com [mailto:navlist@fer3.com] On Behalf
    Of joseph_schultz@rrv.net
    Sent: Thursday, October 22, 2009 11:23 PM
    To: NavList@fer3.com
    Subject: [NavList 10244] Re: SOA vs SMG or SOG
    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
    NavList message boards: www.fer3.com/arc
    Or post by email to: NavList@fer3.com
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