An aid to navigation which uses sound waves

Related Terms

ACOUSTIC

A term pertaining to sound, or the science of sound.

AMBIENT NOISE

The normal sound in a room or other location.

AIRBORNE SOUND

Sound which reaches the point of interest by radiation through the air.

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.

HYDRAULIC CURRENT

A current in a channel caused by a difference in the surface level at the two ends. Such a current may be expected in a strait connecting two bodies of water in which the tides differ in time or range. The current in the East River, N.Y., connecting Long Island Sound and New York Harbor, is an example.

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.

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.

ICE PELLETS

A type of precipitation consisting of transparent or translucent pellets of ice, 5 millimeters or less in diameter. The pellets may be spherical, irregular, or (rarely) conical in shape. They usually bounce when hitting hard ground, and make a sound upon impact. Ice pellets includes two basically different types of precipitation, those which are known in the United States as SLEET and SMALL HAIL. Sleet is generally transparent, globular, solid grains of ice which have formed from the freezing of raindrops or the refreezing o

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