Japan Radio Co. JFE-380, Инструкция по эксплуатации

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Explanation of Terms
Beam angle: The angle that sound waves spread out from the transducer. Sound waves
spread out in a conical manner taking the center of the bottom surface of the transducer at
the apex of the cone.
Bubbling: The phenomenon where the image of the seabed is interrupted due to air bubbles
caused by the ship's hull or the propeller during a voyage.
IMO: stands for International Maritime Organization.
MED: stands for Marine Equipment Directive. This is the directive for marine equipment in
Europe. This directive unifies format approval standards implemented separately by each
European.
NMEA0183: NMEA stands for the National Marine Electronics Association. NMEA0183 is
the format used when sending or receiving depth, position, water temperature, ship speed
and other information between marine equipment.
STC: Sensitivity Time Control is used for reduce shallow water clutter. Shallow seabed
echo is strong and deep seabed echo is weak. So, the STC controls the sensitivity to
normalize seabed echo for precision seabed tracking.
Transducer: Device that emits ultrasonic waves in water and receives the signals reflected
off the seabed. This is equivalent to an antenna on a radio.
UTC: stands for Universal Time Coordinated.
Explanation of Terms x