1. Charts on which tidal current data are depicted graphically. 2. Tidal Current Chart, as published by the National Ocean Survey, part of a set of charts which depict, by means of arrows and figures, the direction and velocity of the tidal current for each hour of the tidal cycle. The charts, which may be used for any year, present a comprehensive view of the tidal current movement in the respective waterways as a whole and also supply a means for readily determining for any time the direction and velocity of the current at various localities throughout the water area covered.

Related Terms


When two different adjacent metals are heated, an electric current is generated between the metals.


An instrument for measuring the magnitude of electric current flow.


A flash, caused by an electric current ionizing a gas or vapor.


Additive for protecting lubricated metal surfaces against chemical attack by water or other contaminants. There are several types of corrosion inhibitors. Polar compounds wet the metal surface preferentially, protecting it with a film of oil. Other compounds may absorb water by incorporating it in a water-in-oil emulsion so that only the oil touches the metal surface. Another type of corrosion inhibitor combines chemically with the metal to present a non- reactive surface.


A term referring to a circuit in which a current is flowing. Also referred to as live.


The time rate of change of velocity; i.e., the derivative of velocity; with respect to time.


Amount of time an unit, equipment or system is run per hour or per 24 hours.


The ability of a fluid that is insoluble in water to separate from water with which it may be mixed in the form of an emulsion.


A device which converts mechanical energy, into alternating current.


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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