A navigation aid intended to mark the sides of a channel or waterway
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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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PORE
A small channel or opening in a filter medium which allows passage of fluid.
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HYDRAULIC CURRENT
A current in a channel caused by a difference in the surface level at the two ends. Such a current may be expected in a strait connecting two bodies of water in which the tides differ in time or range. The current in the East River, N.Y., connecting Long Island Sound and New York Harbor, is an example.
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ICE JAM
An accumulation of broken river ice or sea ice caught in a narrow channel
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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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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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