Glossary Of Terms - JRC JFC-130 Instruction Manual

Bow The front of a vessel (nautical term).
Cavitation Air bubbles in the water which affect the echo level measured by a transducer normally caused
by mounting the transducer at an incorrect angle or location.
Chart speed The rate at which echoes scroll across the display. The higher the chart speed, the clearer the
picture. The slower the chart speed, the more detailed the picture.
Gain The ability of a receiver to receive echoes of different strengths.
You should use more sensitivity for deep water, and less sensitivity for shallow water.
Hull The exterior surface of a ship.
Keel The center of the hull, running from the bow to the stern.
Port Left (nautical term)
Range The depth scale which you can set to either automatic or manual.
The range value appears at the bottom right of your display.
Starboard Right (nautical term).
Stern The rear of a vessel (nautical term).
Transducer A device mounted on the transom of a vessel or though the hull. It sends and receives
ultrasonic signals which determine seabed conditions and the presence of marine life.
White Line A function used to separate fish from bottom structure shown on the display.
Zoom This refers to the magnification of the display to better identify objects or structure.
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Glossary of Terms

Glossary of Terms