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Subject: Re: Silicon Sea: Leg 82
From: Dan Hogan (dhhogan@XXX.XXX)
Date: Tue Dec 04 2001 - 09:52:06 EST
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@XXX.XXX
Nav-L Page: http://www.wa6pby.com
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