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Glossary
Knot: One nautical mile per hour (1.15 statute miles per hour).
LCD: “Liquid Crystal Display” - A technology used to produce flat-
panel displays.
Nautical mile: 6076 feet
Port: Left side of the boat, when facing the bow (nautical term).
PVDF: “Poly Vinylidene Fluoride” – A unique polymer plastic that has
the ability to convert sound waves into electrical impulses. The
process for producing PVDF for commercial use was developed
by Raytheon. PVDF is used in the optional Sidelooker
transducer for excellent detection of fish in the horizontal
direction.
Range: The depth scale for the unit. The maximum distance the unit will
be able to see at a particular range setting.
Sensitivity: The ability of a receiver to distinguish between echoes of
different strengths. In general, use a higher sensitivity setting for
deep water, and a lower setting for shallow water.
Starboard: Right side of the boat, when facing the bow (nautical term).
Statute mile: 5280 ft.
Stern: The rear of a boat (nautical term).
Thermocline: A level in the water where two areas of differing water
temperature meet. Sometimes a thermocline can reflect sonar
waves and present a false display.
Transducer: A device which sends and receives high frequency sound
waves through the water.
Transom: The rear-most part of the boat’s hull, often a flat panel.
White Line: A feature used to help display fish near the bottom. This
feature helps to show the difference between weak returns
(including fish near the bottom) and strong returns (including the
bottom itself).
Zoom: A way of magnifying or enlarging part of the display to give a
better view of a section of the water.