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3. Set the calibration parameters referring to the table below:
Item
Sound speed
Calibration for speed of sound.
Temperature
The water temperature indication is correct-
ed. For example, if the actual temperature is
2°C higher than the temperature displayed
on screen, set the offset to [+2°C].
Bottom level
Set the strength at which an echo is deter-
mined to be the bottom. If the level is too low,
however, it may be difficult to distinguish bot-
tom fish from the bottom echo.
Position to start
Set the depth threshold at which the sounder
bottom detection
detects the seabed.
Zero line rejec-
Turn the zero line (transmission line) on or
tion
off.
Zero line area
Adjusts the transmission line so that the
transmission line disappears when the [Zero
Line Rejector] is turned on. For long tail, in-
crease the value. If the transmission line
does not disappear, lower the TX power.
Zero line fill
Turn off to see fish echoes within 1 m from
the surface.
Draft
The default depth display shows the distance
from the transducer. If you would rather show
the distance from the sea surface, set your
ship's draft. The draft line for HF and LF can
be set respectively.
Gain adjust
If the gain is too high or too low, or the gain
for the low and high frequencies appears un-
balanced, you can compensate it here.
Fish size
Compensate for incorrect fish size indica-
tions.
Calibration set-
Set the target strength (echo strength for in-
tings
dividual fish).
Absorption Coef-
Choose how to calculate the absorption co-
ficient
efficient. The number is a measure of fish
size and hardness (seabed). Used when cal-
culating bottom hardness.
Meaning
Setting value (%)
Adjustment
-80
-75
-65
-50
+50
+100
+200
+300
3. INITIAL SETTINGS
Setting values
200.0 to 2000.0 m/s
-35.0 to +35.0°F
-40 to +40
0.0 to 20.0 m
Off/ On
1.4 to 3.0 m
Off/ On
-9.0 to +30.4 m
-50 to +50
-80 to +300%
1/5
1/4
1/3
1/2
x1.5
x2
x3
x4
-
Manual, Auto
3-11
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