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    TVMDC
    From: Millard Kirk
    Date: 1997 May 06, 17:54 EDT

    Dan Hogan reply to me asking the difference between Compass Coures,
    Magnetic Course, and Course to Steer was an eye opener for me. He had
    previously given me the old TVMDC (uncorrecting) and CDMVT (correcting),
    which I could never remember which went with which.  Since uncorrecting
    and correcting are universal terms, I figured I had better learn which
    went with which so I can understand what someone means when using the
    correcting and uncorrecting. Now it makes sense after thinking about
    it.  Correcting means we are going toward True (making something right)
    and Uncorrecting is going from True to .... Compass.
            It is good to find ways of remembering things and also important to
    understand terms everyone else is using.
            TVMDC					CDMVT			
    True Virgins Make Dull Companions      Can Dead Men Vote Twice
    at Weddings adding	               at Elections
    adding West sub. East                  adding East and Sub West.
    
            UnCorrecting         		    Correcting
               []		    ___ T ___		/\
               []    				[]	
      Add 	   []	 	    ___	V ___		[]	Add
     West	   []      				[]     East
               []       	    ___	M ___		[]
     Subtract  []       		 		[]   Subtract
       East	   []        	    ___	D ___		[]     West
               [] 			                []
               \/		    ___	C ___		[]
            Looking at TVM  makes it easy to understand Dan's statement Magnetic
    Course is True Course adjusted for Variation, and Compass Course is True
    adjusted for both Variation and Deviation. Also looking at the TVMDC one
    can see going from Compass Course to Magnetic Course it is adjusted for
    Deviation only..
            The infamouse Course to Steer, Desire Course or just where I want to go
    take in to account the current, set, drift etc. Boy I hope I got all
    this straight!
            The Celesticomp V asks for Desire Course, +- VAR&DEV, Log Speed,
    Current Direction and Current Velocity.  The results are Course to Steer
    to maintain Desire Course.  Then there is also a program for Course Made
    Good using the same parameters except for Desire Course it asked what
    course did you steer then it will give you the course made good. Boy I
    hope I got all that straight too!!!
            I know this has been lengthly, but I have a couple other questions:
    1) How is desired course plotted on charts?   True or Magnetic?
    2) When one has a Chart that has only the true markings, no compass
    rose, how is course usually plotted? True or magnetic ???
    
    <PRE>
    --
    Learning the Hard Way!!
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     Millard Kirk KB8YQO 	Email - mkirk{at}XXX.XXX
     116 Lewis Ave	     	Homepage- http://webpages.marshall.edu/~mkirk/
     Barboursville, WV      A West Virginia Blue Water Sailor
     25504                  (304) 736-6544
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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