A type of florescent light ballast that uses a magnetic core to regulate the voltage of a florescent lamp.

Category:Energy Terms

The bearing of an object after magnetic variation has been considered, but without compensation for magnetic deviation.

Category:Sea Words

The course of a vessel after magnetic variation has been considered, but without compensation for magnetic deviation.

Category:Sea Words

Compass error. The difference between the reading of a compass and the actual magnetic course or bearing due to errors in the compass reading. These errors can be caused by metals, magnetic fields and electrical fields near the compass. The act of checkin ...

Category:Sea Words

The direction to which a compass points. Magnetic north differs from true north because the magnetic fields of the planet are not exactly in line with the north and south poles. Observed differences between magnetic and true north is known as magnetic var ...

Category:Sea Words

The difference between magnetic north and true north, measured as an angle. Magnetic variation is different in different geographic locations, so the nearest compass rose to each location on a chart must be used.

Category:Sea Words

The direction, with respect to magnetic north, from which the wind is blowing. Distinguish from true wind direction.

Category:Meteorology

Naturally occurring magnetic oxide of iron (Fe3O4).

A cup anemometer with its shaft mechanically coupled to a magneto.

Category:Meteorology

A recording magnetometer.

Category:Meteorology

General name for an instrument which measures the earth's magnetic field intensity.

Category:Meteorology

MAh

The term "mAh" means "milliamp hours"; it is on most rechargeable battery labels. It refers to the amount of time you can expect a fully charged battery to last. For example, if the battery label states "2,400 mAh," it means the battery can power a device ...

Category:Abbreviations

Marine Accident Investigation Branch

Category:Abbreviations

First voyage of a ship.

Category:Sea Words

The tallest mast; the forward mast of a yawl or ketch; the mast furthest aft on a schooner

Category:Sea Words

A topsail on the main mast.

Category:Sea Words

The principal sail that is set on the main mast.

Category:Sea Words

The line that controls the angle of the mainsail in its relation to the wind.

Category:Sea Words

Hoisting the ensign at 8 a.m. and down at sunset.

Category:Sea Words

To attach a line to something so that it will not move.

Category:Sea Words