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7. FISH FINDER (SOUNDER)
7-5
7.2.5 Bottom discrimination display
The bottom discrimination display, which requires a bottom discrimination capable
transducer or Bottom Discrimination Sounder BBDS1 or Network Fish Finder DFF1-
UHD, identifies probable bottom composition. The display is available in all screen di-
visions, single or dual frequency mode, and occupies the bottom 1/6 of the screen in
the full screen display.
Use this feature with ship speed 10 knots or less and depths between 5 and 100 m.
How to active or deactivate the bottom discrimination display
1. Open the home screen, then tap [Settings] - [Sounder].
2. Tap [Fish Finder Source].
3. Tap [TZTL12F],[TZTL15F], [BBDS1] or [DFF1-UHD] as applicable.
4. Tap the close button to finish.
5. To activate or deactivate the bottom discrimination display, turn [Bottom] on or off
from the pop-up menu.
7.3 Automatic Fish Finder Operation
Your fish finder can be adjusted automatically to let you do other tasks.
7.3.1 How the automatic fish finder operates
The automatic fish finder function automatically adjusts the gain, clutter, TVG, echo
offset and range. The main features of the automatic mode are as shown below.
• Gain adjusts the sensitivity of the receiver to show the bottom echo in reddish-
brown (default color arrangement).
• Clutter automatically reduces low-level noise like plankton.
• The TVG function is automatically adjusted.
• The echo offset balances the gain on high and low frequencies.
• Range is adjusted automatically to show the bottom echo.
Bottom
discrimination
display
Rock Gravel
Sand
Mud
Sand and rock are the most likely bottom type in this example.
ft
LF
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