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    SOA vs SMG or SOG
    From: Irv Haworth
    Date: 2009 Oct 20, 18:24 -0700
    I'm somewhat perplexed over current usage of abbreviations: to wit the old (last 25 years ?)  standard meaning of SAO (speed of advance) versus what  I believe is the current view as presumably held by WMO (World Metro Org. ) who supply ships with free equipment and training to report weather..VOS (Voluntary Obs ...)
    What follows is an slightly edited (name of ship etc removed by me) recent report.
    The noon to noon report based on positions shows 425 NM ( my Rhumb calc. gives 424.5 NM) which they report as a SAO of 17.7 kts.
    To me the SAO should more rightly be termed the SMG (speed made good) .
    I contacted the webmaster but despite being an old US Navy chap had no idea.
    Hopefully some members might shed some light on matter for someone who may have slipped a notch or two without realizing the new movement....hi..hi
    himself aka Irvin

    Last reported at 2009-Oct-19 12:00 UTC. Time now 2009-Oct-19 18:30 UTC.
    S 17°12', W 179°42'.

    Wind from 160 at 14 knots

    Waves 1.0 meters (3 feet), 10 second period

    Barometer 1012.0 mb
    Air temperature 25.0 ° C
    Dewpoint 19.1 ° C

    Notes date/time lat lon naut. miles run SOA wind from knots barom. wave height air temp dew point water temp
    2009-Oct-19 12:00 S 17°12' W 179°42' 425 17.7 160 14 1012.0 1.0 25.0 19.1
    2009-Oct-18 12:00 S 15°00' W 172°42' 50 16.6 120 12 1010.2 1.5 26.0 21.8

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