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16 Cards in this Set
- Front
- Back
terrestrial navigation
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navigation of or relating to earthly bodies.
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great circle
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The intersection of a sphere and a plane through its center.
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terrestrial equator
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great circle whose plane is perpendicular to the polar axis.
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terrestrial meridian
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A north-south reference line, particularly a great circle through the geographical poles of the earth.
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prime meridian
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passes through 0 longitude, used as the origion for the measurements of longitude located in Greenwich, England.
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terrestrial longitude
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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.
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terrestrial latitude
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angular distance from the equator measured northward or southward through 90 and labeled N or S to indicate direction
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small circle
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The intersection of a sphere and plane which does not pass through its center.
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parallel of latitude
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a circle on the surface of the earth parallel to the equator used to determine latitude.
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departure
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The point at which reckoning of voyage begins.
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nautical mile
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considered the length of 1 minute of any great circle of the earth, the meridian being the great circle most commonly used.
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knot (speed)
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a unit of speed equal to one nautical mile per hour.
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heading
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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.
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rhumb line
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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.
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course
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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.
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bearing
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the horizontal direction of one terrestrial point from another, expressed as the angular distance from a reference point.
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