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AIS

Automatic Identification System.

Related Terms

GYROPILOT

An automatic device for steering a vessel by means of control signals received from a gyrocompass. Also called AUTOPILOT

FROST FREE REFRIGERATOR

Refrigerated cabinet which operates with an automatic defrost during each cycle.

SAFETY RELIEF VALVE

An automatic pressure actuated relieving device suitable for use as either a safety or relief valve, depending on application.

LANE COUNT

An automatic method of counting and totaling the number of hyperbolic or circular lanes traversed by a moving vessel.

ADF REVERSAL

The swinging of the needle on the direction indicator of an automatic direction finder throug

AUTOMATIC DIRECTION FINDER

A radio direction finder in which the bearing to the transmitter is indicated automatically and continuously, in contrast with a MANUAL RADIO DIRECTION FINDER which requires manual operation. Also called AUTOMATIC RADIO DIRECTION FINDER (ADF).

CONTINUOUS CARRIER RADIOBEACON

A radiobeacon whose carrier wave is unbroken but which is modulated with the identification signal. The continuous carrier wave signal is not audible to the operator of an aural null direction finder not having a beat frequency oscillator. The use of the continuous carrier wave improves the performance of automatic direction finders. The marine radiobeacons on the Atlantic and Pacific coasts of the U.S. are of this type.

COURSE RECORDER

A device which makes an automatic graphic record of the headings of a vessel vs. time

MINOR LIGHT

An automatic unmanned light on a fixed structure usually showing low to moderate intensity. Minor lights are established in harbors, along channels, along rivers, and in isolated locations.

PURGE INTERLOCK

A device so arranged that an air flow to the furnace above a minimum must exist for a definite time interval before the interlocking system will permit an automatic ignition torch to be placed in operation.
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