NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Silicon Sea: Leg 82
From: Dan Hogan
Date: 2001 Dec 04, 7:52 AM
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@verimail.com Nav-L Page: http://www.wa6pby.com