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    Re: SOA vs SMG or SOG
    From: Byron Franklin
    Date: 2009 Oct 29, 09:07 -0700

    Not specified, but standard rudder. A CVA/CVS. well over 1000 feet
    takes a lot of distance to change on to a new course, Bowditch has a
    SLIDE BAR that I sent to Brown, before 1977. The purpose was to end up
    on the charted track (DR) when you are not on the track (early(inside/
    outside. or late) when using turing bearings. The new Bowditch still
    has it.
    
    On Oct 23, 2:58�pm, Greg Rudzinski  wrote:
    > 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
    > >  > =-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 �- Hide quoted text -
    >
    > - Show quoted text -
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