Furuno FCV-1900, Руководство по установке

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3. INITIAL SETTINGS
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3.6 Calibration Setting
The [Calib] menu mainly lets you apply offsets to speed, water temperature, and bot-
tom level.
[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 correct it here. For ex-
ample, if the water temperature indication is 2°F higher than actual water temperature,
enter -2°F.
[Bottom Level] : In the default bottom level setting (+0), the equipment judges con-
secutive 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 Detect Mode ]: Select whether the bottom lock display detects the bottom
based on the signal level or echo color.
• [Level]: The bottom lock display detects the bottom based on the signal level.
• [Color]: The bottom lock display detects the bottom based on the echo color. When
[Color] is selected, adjust [Color Level Threshold].
[ Color Level Threshold ]: This menu item is available when [Bottom Detect Mode] is
set to [Color]. The higher the setting, the strong color echo (reddish brown, red) is rec-
ognized as the bottom.
[Zero Line Rejection] : Turn the zero line (transmission line) on or off. When it is
turned on, the transmission line disappears, which allows you to see fish echoes near
the surface clearly. The length of the transmission line changes with transducer used
and installation characteristics. If the width of the transmission line is 0.4 m (default
value) or more, set the transmission line width with [Zero Line Area], as below.
[Zero Line Area] : This feature adjusts the transmission line so that the transmission
line disappears when the menu item [Zero Line Rejection] is turned on. For a long tail
increase 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.
*: Not available depending on the
side looking setting. For details, see
the operator’s manual.
Sound Speed
Temp
Bottom Level*
Bottom Detect Mode
Color Level Threshold
Zero Line Rejection
Zero Line Area
Zero Line Fill
Draft
Gain ADJ
Fish Size*
Time Offset
1500.0 m/s
0.0ºF
Level
50
On
4.5ft
On
0
0:00
Bottom Level*
Zero Line Rejection
Zero Line Area
Draft
Gain ADJ
Fish Size*
On
4.5ft
0
For [Setting] tab For [External fish finder] tab