Raytheon V8010 User Manual

echoes are displayed on the echo sounder (or not) can depend on several
factors including:
*The type or species of the fish
l Number and sires of the fish
l Depth of fish below the boat
l Gain control setting
*Transmitter Power and frequency
l Transducer beam angle
l Speed of the boat
l Turbulence in the water
1.3.l DETERMINING BOTTOM CONDITIONS
To understand how bottom conditions affect the bottom echo’s appear-
ance on the display, consider the signal transmitted from the transducer as
a cone-shaped beam of approximately 10 degrees. If the sea bottom were
as hard and flat as a mirror, only the signal directly under the transducer
would be reflected back to the transducer, and there would be a narrow
bottom echo line printed on the display screen.
1 Hard Bottom (Sand] 1
H
. _,
1 Soft(Mud] Bottom /
Rock [Live] Bottom
This type of echo line is typical characteristic of hard sandy sea bottoms.
Sometimes when the depth is shallow and the bottom is very hard ,a second
echo can appear at exactly double the depth of the true bottom echo.
If the sea bottom is softer (sea grasses or muddy), the echo bottom line
would print thicker on the screen. This is because the echo consists not only
of that weaker echo reflected from the top surface of the grass or mud, but
IN’I’BODUCTION 4

Raytheon V8010 Specifications

General

Brand	Raytheon
Model	V8010
Category	Marine Equipment
Language	English