Furuno GP-3700F, Operator'S Manual

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11. ECHO SOUNDER
11-30
11.21 Interpreting the Display
This section provides, using typical examples, the information necessary for interpret-
ing the echo sounder display.
Color bar
The color bar shows the relation between echo inten-
sity and echo color on the screen. The top color (red-
dish-brown) is the strongest color and the lower colors
the weakest. The bar can be used as a reference to es-
timate density of a school of fish, fish specifies and
hardness of the bottom. The background color can be
selected on the menu (see section 11.11).
Minute mark
The minute mark displays a minute worth of time with two colored bars, each bar 30
seconds in time. It is useful for estimating elapsed time.
Zero line
The zero line (transmission line) shows the position
of the transducer. The line disappears from the
screen when the range is shifted.
Color bar
Bottom
School of fish
Minute mark
Zero line
Color bar
Strong Strong
Weak
Reddish brown
Red
Yellow
Green
Blue
Zero line
Range shifted