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1. OPERATION
10
1.14 A-scope Display
The A-scope display shows echoes at each
transmission with amplitudes and tone pro-
portional to their intensities, on the right 1/3 of
the screen. The display shows strong echoes
with strong amplitude; weak echoes in weak
amplitude. Thus the A-scope display is useful
for estimating the kind of school of fish and
bottom composition.
Note: The A-scope display is only available
with the high frequency display in dual fre-
quency operation.
1. Open the menu, select [Display] and
press the ENTER key.
2. Select [A-Scope] and
press the ENTER key.
3. Select the A-scope pre-
sentation type desired
and press the ENTER key.
[Off]: Turn off the A-scope display.
[Normal]: Display shows echoes at each
transmission with amplitudes and tone
proportional to their intensities.
[Peak]: "Normal" A-scope display plus
peak-hold amplitude picture for last five
seconds in dots.
4. Press the MENU/ESC key twice to close
the window.
Directional angle display
With the transducer selected for other than
600 W or 1kW (FCV-587 only), directional an-
gle range line, direction angle, directional ra-
dius, directional radius value and directional
radius line appear on the A-scope display.
The directional angle display provides an at-
a-glance view of the available detection
range. In the example below an echo from a
school of fish is at the depth of 20 m. and with-
in 8. 5 m radius of the center of the transducer
beam.
Note: The directional angle range lines repre-
sent the transducer beamwidth. They are not
an indication of echo strength.
Weak reflection
(small school of
fish or noise)
Past amplitude
pictures are
displayed with
dots in [Peak]
mode.
A-scope
display
Reflection
from school
of fish
Single freq.
display
Strong
reflection
(bottom)
AUTO
_
R
G:AF
AUTO
_
R
G:AF
LF
LF
x1
x1
59.8
m
59.8
m
0.0
0.0
8.5
25.5
25.5
0
20
40
60
80
0
20
40
60
80
Directional
angle radius
Directional
angle radius
line
Directional
angle range
line
School of
fish
LF
LF
x1
x1
0.0
0.0
8.5
25.5
25.5
0
20
40
60
80
0
20
40
60
80