Furuno GP-3700F, Operator'S Manual

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11. ECHO SOUNDER
11-7
11.2.9 Plotter/echo sounder display
This display provides the plotter display and the echo sounder display (single or dual
frequency) at the same time. It is useful for searching schools of fish at cruising speed.
Note that vertical division is also available.
• Horizontal two-way split: Plotter display is displayed on the upper half of the screen
and echo sounder display (single or dual frequency) on the bottom half.
• Vertical two- way split: Plotter display or echo sounder display (single frequency) is
displayed on the left half or right half of the screen.
• Three-way split: Plotter display is displayed on the upper left or right of the screen
and echo sounder display (single or dual frequency) on the bottom half.
Low frequency
(50 kHz)
High frequency
(200 kHz)
Blue
Red
Green
Yellow
Orange
Reddish-
brown
Reddish-
brown
+
Discriminator
Reddish-brown Reddish-brown
Yellow
Blue
Green
Blue
These echoes are
likely to be small fish.
Displayed in blue since high
frequency echo is weaker.
Displayed in reddish-brown
since high frequency echoes
are red or reddish brown.
Plotter display
Echo sounder display