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    Re: SOA vs SMG or SOG
    From: Irv Haworth
    Date: 2009 Oct 23, 13:42 -0700

    Hi Greg
    Yes I'm familiar with the ships  "advance" , etc as posted in the bridge.
    Unfortunately I  do not understand your last sentence. ( To me SOA means on
    a normal DR plot , the intended speed required...whereas SMG is the actual
    speed achieved from point A to B ) Given this I need another few words to
    clarify ..."terminology conflicts". please
    73
    Irv
    
    -----Original Message-----
    From: navlist@fer3.com [mailto:navlist@fer3.com] On Behalf
    Of Greg Rudzinski
    Sent: Friday, October 23, 2009 11:59 AM
    To: NavList
    Subject: [NavList 10261] Re: SOA vs SMG or SOG
    
    
    Irv,
    
    Advance refers to the distance a ship moves forward during a 90� turn at a
    specified rudder angle. Advance, transfer, and other ships characteristics
    are posted on the bridge as per CFRs. Using SOA in place of SMG would lead
    to a possible terminology conflict.
    
    Greg
    
    On Oct 20, 6:24�pm, "Irv Haworth"  wrote:
    > 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.
    > Position
    >  .2&lon =-179.7&radius=300> 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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