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1. A person who navigates or is directly responsible for the navigation of a craft. 2. A book of instructions on navigation, such as the The American Practical Navigator (Bowditch).

Related Terms

CREW LIST

The list prepared by the master of a ship showing the full names, nationality, passport or discharge book number, rank and age of every officer and crew member engaged on board that ship and is one of the essential ship's documents presented to the customs and immigration authorities on arrival at a new port.

SAILING DIRECTIONS

1. A descriptive book for the use of mariners, contain- ing detailed information of coastal waters, harbor facilities, etc. of an area. For waters of the United States and its possessions, they are published by the National Ocean Survey and are called UNITED STATES COAST PILOTS. Sailing directions, as well as light lists, provide the information that cannot be shown graphically on the nautical chart and that is not readily available elsewhere.

LAW

A system of principle and rules of human prescribed or organized by the book

GRID NAVIGATION

Navigation by the use of grid directions

HOMING

Navigation toward a point by following a signal from that point. Radiobeacons are commonly used for homing.

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

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.

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.

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.

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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