Bottom Level - Furuno FCV-1150 Operator's Manual

Sound Speed
Adjust the sound velocity of the Tx/Rx signal
if the depth indication is incorrect, because of
water temperature or salinity density.
Temp
If the water temperature indication is wrong,
you can apply an offset to it to correct it. For
example, if the water temperature indication is
2° higher than actual water temperature, enter
-2. For details, refer to the installation manual.
Speed STW
If the speed indication is wrong, you can apply
an offset to it to correct it. For example, if the
speed indication is 10% lower than actual
speed, enter +10. For details, see the installa-
tion manual.

Bottom Level

In the default bottom level setting (0), the
equipment judges consecutive strong echoes
to be bottom echoes. If, in that setting, the
depth indication is unstable, adjust the bottom
level. If vertical lines extend upward from the
bottom echo in the bottom lock display, lower
the bottom level to erase the vertical lines. If
the level is too low, however, it may be difficult
to distinguish bottom fish from the bottom
echo.
Bottom lock display
MANUAL L:2.0/H:2.0 BL-LF
47.2
ft
Bottom
Set the bottom level so that these
vertical lines just disappear.
Zero Line
Turn the zero line (transmission line) on or off.
When turned off, the transmission line disap-
pears, which allows you to better watch fish
echoes near the surface. The length of the
transmission line changes with transducer
used and installation characteristics. If the
width of the transmission line is 4.5 ft (default
value) or more, set the transmission line width
with Zero Line Area, as below.
Zero Line Area
This feature adjusts the width of the transmis-
sion line from the area specified when the
menu item Zero Line is turned off. The effec-
tive range is 4.5 to 9.8 ft. For a long tail, in-
crease the value. If the transmission line does
not disappear, raise the STC or lower the Tx
power.
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