Glossary Of Terms - Raymarine L750 Operating Handbook

Glossary

Glossary of Terms

Aft:
Background noise: False or meaningless echo returns produced by
Bow:
Cavitation:
Chart Speed:
Cursor:
Deadrise angle:
Default value:
Fairing block:
Fathom:
Frequency:
Fore:
Gain:
Keel:
Near or toward the rear part of the boat (nautical
term).
bubbles, water turbulence, or debris
The front of the boat (nautical term).
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.
The rate at which echoes scroll across the display.
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 up- and down-
controls on the Trackpad.
The slope or angle of the underside of the hull,
measured in the side-to-side direction.
A value or setting which is pre-loaded into the unit
at the factory.
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.
A unit of depth equal to 6 feet.
The rate at which a sound source vibrates, or the
rate at which a sound wave changes.
Near or toward the front part of the boat (nautical
term).
The ability of a receiver to distinguish between
echoes of different strengths. In general, use a
higher gain setting for deep water, and a lower
setting for shallow water.
The center of the hull, running from the bow to the
stern.
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