Furuno FCV-627, Operator'S Manual

Page: 19 / 65

1. OPERATION
11
4. Press the MENU/ESC key twice to close
the window.
A-scope display
Directional angle display
With the transducer selected for other than
600 W, directional angle range line, direction
angle, directional radius, 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 within 8. 5 m radius of the center of the
transducer beam.
1.15 Fish Information
(ACCU-FISH)
The ACCU-FISH feature measures the length
of individual fish and tags the fish with a fish
symbol whose size is proportional to the
length of the fish. The length or depth of the
fish can be indicated digitally. Connection to a
transducer that supports ACCU-FISH is re-
quired.
Note: The fish length found by this fish finder
is intended for reference purposes; it is not a
completely accurate measurement of fish
length.
Considerations for the ACCU-FISH
• The 600 W transducers which support
ACCU-FISH are 520-5PSD, 520-5MSD,
525-5PWD, 525STID-MSD and
525STID-PWD.
• Echo intensity depends on fish species.
When the fish length differs between the in-
dicated length and the actual length, you
can compensate the difference on the
[Calib] menu (see section 2.6).
• ACCU-FISH is inoperative when the zero
line rejector is active.
• High and low frequencies are alternately
transmitted when ACCU-FISH is active, re-
gardless of mode selection.
• A fish whose depth is shallower than 2 m or
greater than 100 m cannot be measured.
• If the transducer is installed inside the hull,
the signal is attenuated by the hull. There-
fore, a fish may not be detected or the fish
length indicated may be shorter than actual
length.
• In a school of fish, echoes overlap one an-
other, so the margin of error will be greater.
• The bottom echo must be present to show
the fish symbols.
• The TX pulse length changes according to
ACCU-FISH On/Off state. This causes a
difference in both sensitivity and the ech-
oes viewed.
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