A call requesting direction in answer to the report of a lookout that an object has been sighted.

An inert gas. A colorless, monatomic element which is found to occur in dry air to the extent of only 0.000524 percent by volume. Helium is very light, having a molecular weight of only 4.003 and specific gravity referred to air of 0.138. Because helium i ...

Also VMG. Actual boat speed after adjusting for such factors as current and leeway.

The ring bolted to the upper end of the shank of an anchor and to which the bending shackle secures.

Electromagnetic radiation of shorter wavelength than visible radiation but longer than x-rays, between 0.02 and 0.4 micron (200 and 4000 angstrom).

International Marine Contractors Association

Same as instrument shelter.

The interval between the lower and upper measuring limits of an instrument, i.e. a thermometer with a range of -35 to 50

The process of plotting a theoretical position or future position based on advancing from a known position using speed, time, and course, without aid of objects on land, of sights, etc. Term comes from deduced reckoning, abbreviated first to "ded reckonin ...

Short Range Certificate (radio)

The array of indicating marks and figure in relation to which the position of an index is observed, i.e. a scale plate on a recorder.

An abbreviation of forecastle.

To haul in until the line has a strain upon it.

European Sea Ports Organisation

Transportation charge advanced by one carrier to another to be collected by the later carrier from the consignor or consignee.

The net transfer of electric charge per unit time. Also called electric current. See also current density.

Is a gas that follows the perfect gas laws without deviation. There is no such thing, however it is the basis from which calculations are made and corrections applied.

Ropes hung and used for assistance in ascending and descending.

A type of wind turbine in which the axis of rotation is perpendicular to the wind stream and the ground.

The concept of capturing and converting the energy available in the motion of ocean waves to energy.