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### 16 Cards in this Set

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 terrestrial navigation navigation of or relating to earthly bodies. great circle The intersection of a sphere and a plane through its center. terrestrial equator great circle whose plane is perpendicular to the polar axis. terrestrial meridian A north-south reference line, particularly a great circle through the geographical poles of the earth. prime meridian passes through 0 longitude, used as the origion for the measurements of longitude located in Greenwich, England. terrestrial longitude the arc of a parallel, or the angle at the pole, between the prime meridian and the median point measured eastward or westward 180 of the prime meridian. terrestrial latitude angular distance from the equator measured northward or southward through 90 and labeled N or S to indicate direction small circle The intersection of a sphere and plane which does not pass through its center. parallel of latitude a circle on the surface of the earth parallel to the equator used to determine latitude. departure The point at which reckoning of voyage begins. nautical mile considered the length of 1 minute of any great circle of the earth, the meridian being the great circle most commonly used. knot (speed) a unit of speed equal to one nautical mile per hour. heading the horizontal direction a ship points at any instant, expressed in angular units from a reference direction, usually from 000 at the reference direction through 360. rhumb line a line on the surface of the eart making the same oblique angle with all meridians, making a loxodrome curve that spirals toward the poles in a constant true direction. course the direction at which a vessel is steered or intended to be steered, expressed as angular distance from North, usually from 000 at north, clockwise through 360. bearing the horizontal direction of one terrestrial point from another, expressed as the angular distance from a reference point.