Furuno FCV-2100, Installation Manual

Page: 39 / 59

3. INITIAL SETTINGS
3-11
3. Set the calibration parameters referring to the table below:
Item Meaning Setting values
Sound speed Calibration for speed of sound. 200.0 to 2000.0 m/s
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]. -35.0 to +35.0°F
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. -40 to +40
Position to start
bottom detection Set the depth threshold at which the sounder
detects the seabed. 0.0 to 20.0 m
Zero line rejec-
tion Turn the zero line (transmission line) on or
off. Off/ On
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. 1.4 to 3.0 m
Zero line fill Turn off to see fish echoes within 1 m from
the surface. Off/ On
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. -9.0 to +30.4 m
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. -50 to +50
Fish size Compensate for incorrect fish size indica-
tions. -80 to +300%
Calibration set-
tings Set the target strength (echo strength for in-
dividual fish). -
Absorption Coef-
ficient Choose how to calculate the absorption co-
efficient. The number is a measure of fish
size and hardness (seabed). Used when cal-
culating bottom hardness. Manual, Auto
Setting value (%)
-80
-75
-65
-50
+50
+100
+200
+300
Adjustment
1/5
1/4
1/3
1/2
x1.5
x2
x3
x4