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    Re: Silicon Sea: Leg 82
    From: Dan Hogan
    Date: 2001 Dec 04, 7:52 AM

    Definitions from The American Practical Navigator, Pub. No. 9, Bowditch, 1995
    Ed.
    
    Heading n. The horizontal direction in which a a ship actually points or
    heads at any instant, expressed in angular units from a reference direction,
    usually from 000deg at the reference direction clockwise through 360deg.
    Heading is often designated as true, magnetic, compass, or grid. Heading
    should not be confused with COURSE, which is the intended direction of
    movement through the water. At a specific instant the heading may or may not
    coincide with the course. The heading of a ship is also called SHIP'S HEAD.
    
    Compass Course. Course relative to compass north.
    
    Course, n. The direction in which a vessel is steered or intended to be
    steered, expressed in angular distance from north, usually from 000deg at
    north, clockwise through 360deg. Strictly the term applies to direction
    through the water, not the direction intended to be made good over the
    ground. The course is often designated as true, magnetic, magnetic, compass,
    or grid as the reference direction is true, magnetic, compass, or grid north,
    respectively. TRACK MADE GOOD is the single resultant direction from the
    point of departure to point of arrival at any given time. The use of this
    term to indicate a single resultant direction is preferred to the use of the
    misnomer course made good. A course line is a line, as drawn on a chart,
    extending in the direction of a course. See also COURSE ANGLE, COURSE OF
    ADVANCE, COURSE OVER GROUND, HEADING, TRACK.
    
    
    
    
    
    Dan Hogan WA6PBY
    C27 "Gacha"
    dhhogan{at}verimail.com
    Nav-L Page: http://www.wa6pby.com
    

       
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