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The nautical star is an informal signifier indicating membership in the United States Coast Guard, United States Navy, or United States Marine Corps. The symbol recalls both the five-pointed star of the US national flag and the color pattern of the compass rose found on many nautical charts. Insignia including nautical stars:
4 - Compass north, including a two-part error; the magnetic variation (6) and the ship's own magnetic field (5) 5 - Magnetic deviation, caused by vessel's magnetic field. 6 - Magnetic variation, caused by variations in Earth's magnetic field. 7 - Compass heading or compass course, before correction for magnetic deviation or magnetic variation.
A bearing is the angle between the line joining the two points of interest and the line from one of the points to the north, such as a ship's course or a compass reading to a landmark. On nautical charts, the top of the chart is always true north , rather than magnetic north , towards which a compass points.
A navigator on watch does not always have a corrected compass available with which to give an accurate bearing. If available, the bearing might not be numerate. Therefore, every forty-five degrees of direction from north on the compass was divided into four 'points'. Thus, 32 points of 11.25° each makes a circle of 360°.
In 1967, the U.S. Navy developed the Timation satellite, which proved the feasibility of placing accurate clocks in space, a technology required for GPS. [27] In the 1970s, the ground-based OMEGA navigation system, based on phase comparison of signal transmission from pairs of stations, [28] became the first worldwide radio navigation system ...
32-point compass rose. The points of the compass are a set of horizontal, radially arrayed compass directions (or azimuths) used in navigation and cartography.A compass rose is primarily composed of four cardinal directions—north, east, south, and west—each separated by 90 degrees, and secondarily divided by four ordinal (intercardinal) directions—northeast, southeast, southwest, and ...
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In 1867, the Navy Department took the Academy under direct supervision, but for many years the Bureau of Navigation continued to provide routine administration and financial management. From 1865 to 1884, the Bureau was responsible for the Office of Detail, which handled the assignment and detailing of naval officers .