Said of a floating aid to navigation which is not on station with its whereabouts unknown.
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GROUP REPETITION INTERVAL
The specified time interval of a Loran C chain for all stations of the chain to transmit their pulse groups. For each chain a minimum group repetition interval (GRI) is selected of sufficient duration to provide time for each station to transmit its pulse group and additional time between each pulse group so that signals from two or more stations cannot overlap in time anywhere within the coverage area. The GRI is normally stated in terms of tens of microseconds; i.e., the GRI having a duration of 79,900 microseconds is stated as 7900.
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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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INTERNATIONAL CALL SIGN
An alpha-numeric symbol assigned in accordance with the provisions of the International Telecommunications Union to identify a radio station. The nationality or the radio station is identified by the first three characters; also referred to as call letters or signal letters.
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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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NAVAL STATION
A naval base; a naval air station is a base for naval aircraft.
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