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    Re: SOA vs SMG or SOG
    From: Byron Franklin
    Date: 2009 Oct 28, 12:46 -0700

    
    
    On Oct 27, 5:35�pm, QMCM  wrote:
    > Nice to see that GREG has and uses BOWDITCH NO.9 1977. I have one with
    > my name printed in gold on the cover. It was in thanks for using
    > several of my articals and introducing The Franklin Piloting, The
    > Graduated perpendiclar bisector, for the three point problem (Sextant)
    > and asisting in other items of the Piloting section. After the editor
    > 'Ernest Brown retired, PUB.9 loss most of it's sea man piloting in
    > favor of the eletronics. I may want to enter NAVLIST with some of
    > those history, past papers.
    >
    > On Oct 23, 7:33�pm, Greg Rudzinski  wrote:
    >
    > SMG is between a fix and Estimated position. Not to sure of actual speed.
    SOA is is the speed that you intend to make.Perhaps to a rendezvous
    ( what you thik your ship will make. You may encluded the speed used
    on a paper maneuvring board for radar vectors.
    >SOG Is speed between good fixes, actual movement, SINS  or tracking ship 
    speed by radar and a difinite ground target.
    
    > > Irv,
    >
    > > I will quote Bowditch vol. 1 edition 1977 page 61 "The expression
    > > speed of advance (SOA) is used to indicate the speed intended to be
    > > made along the track, and speed over ground (SOG) the speed along the
    > > path actually followed. Speed made good (SMG) is the speed along the
    > > course made good." I never used the acronym SOA in my merchant days
    > > but it does appear to have applications when diverting for weather,
    > > rescue, or rendezvous. The terminology conflict is that the word
    > > ADVANCE is used to describe two very different actions regarding ship
    > > movement.
    >
    > > Greg
    >
    > > On Oct 23, 1:42�pm, "Irv Haworth"  wrote:
    >
    > > > 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- Hide quoted text -
    >
    > > - Show quoted text -- Hide quoted text -
    >
    > - Show quoted text -
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