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Glossary of Terms
Aft: Near or toward the rear part of the boat (nautical term).
Background noise: False or meaningless echo returns produced by
bubbles, water turbulence, or debris
Bow: The front of the boat (nautical term).
Cavitation: Air bubbles in the water which affect the readings of a
transducer. These are normally caused by mounting the transducer
at an incorrect angle or location.
Chart Speed: The rate at which echoes scroll across the display.
Cursor: On a setup display, the place where the unit is ready to make a
change or enter new information. This point is highlighted. You can
move up or down the list or display using the
Deadrise angle: The slope or angle of the underside of the hull, mea-
sured in the side-to-side direction.
Default value: A value or setting which is pre-loaded into the unit at the
factory.
Fairing block: A block used when mounting a thru-hull transducer. The
fairing block shims the transducer to align it on a perfect horizontal
plane versus the rise of the hull.
Fathom: A unit of depth equal to 6 feet.
Frequency: The rate at which a sound source vibrates, or the rate at
which a sound wave changes.
Fore: Near or toward the front part of the boat (nautical term).
Keel: The center of the hull, running from the bow to the stern.
kHz: "Kilo-Hertz" – a measure of frequency (For example, 200 kHz =
200,000 oscillations per second.)
Kick-up bracket: A bracket which is installed on the transom of a boat
and holds the transducer in place. When the transducer strikes an
obstruction, it is designed to release or "kick up" out of the water to
prevent any damage.
Glossary
and
controls.
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