The art and science of conducting a boat safely from one point to another.
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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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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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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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JUNCTION MARK
A navigation mark which, when viewed from a vessel approaching from the open sea or in the same direction as the main stream of flood current, or in the direction established by appropri- ate authority, indicates the place at which two channels meet.
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L-2 SIGNAL
The second L-band signal of the GPS satellite, transmitted at 1227.60 MHz, modulated with the P-code and navigation message.
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IONOSPHERIC CORRECTION
A correction for ionospheric refraction, a major potential source of error in all satellite radionavigation systems. Navigation errors can result from the effect of refraction on the measuremen
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DAYBOARD
The daytime identifier of an aid to navigation presenting one of several standard shapes (square, triangle, rectangle) and colors (red, green, white, orange, yellow, or black).
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