An aid to navigation which transmits information through its visible characteristics. It may be lighted or unlighted.
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GRID NAVIGATION
Navigation by the use of grid directions
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HOMING
Navigation toward a point by following a signal from that point. Radiobeacons are commonly used for homing.
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RUST PREVENTION TEST
A test for determining the ability of an oil to aid in preventing the rusting of ferrous parts in the presence of water.
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INERTIAL ALIGNMENT
The process of orienting the measuring axes of the inertial components of inertial navigation equipment with respect to the coordinate system in which the equipment is to be used. inertia
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INLAND RULES OF THE ROAD
Officially the Inland Navigation Rules; Rules to be followed by all vessels while navigating upon certain defined inland waters of the United States.
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IMPROVED CHANNELS
Dredged channels under the jurisdiction of the U.S Army Corps of Engineers, and maintained to provide an assigned CONTROLLING DEPTH. Symbolized on National Ocean Survey charts by black, broken lines to represent side limits, with the con- trolling depth and date of the survey given together with a tabulation of more detailed information
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INTERNATIONAL HYDROGRAPHIC BULLETIN
A publication, published monthly by the International Hydrographic Bureau for the International Hydrographic Organization, which contains information of current hydrographic interest.
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INOPERATIVE
Said of a sound signal or radionavigation aid out of service due to a malfunction
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INTEGRATED NAVIGATION SYSTEM
A navigation system which comprises two or more positioning systems combined in such manner as to achieve performance better than each constituent system.
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IONOSPHERIC ERROR
The total systematic and random error resulting from the reception of a navigation signal after ionospheric reflections. It may be due to variations in transmission paths, non-uniform height of the ionosphere, or non-uniform propagation within the iono- sphere. Also called IONOSPHERIC-PATH ERROR, SKYWAVE ERROR.
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