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1. OPERATIONAL OVERVIEW
1-15
1.11 Suppressing Clutter
When blue dots appear over the entire screen (mainly caused by sediments in
the water), use the clutter function to suppress them.
1. Rotate the [FUNCTION] switch to choose CLUTTER.
Change echo color
assignment.
[-/+]: Change setting
[EXIT]: Exit
LOW HIGH
CLUTTER
Color changes
depending on
clutter level
and curve.
HF•CLUTTER : 2 (0 5)
HF•CURVE : STD
LF•CLUTTER : 2 (0 5)
LF•CURVE : STD
Clutter menu
• For dual frequency display: Go to step 2.
• For other modes: Go to step 3 after pressing the [▼] key.
2. Press the [▲] or [▼] key to choose HF CURVE or LF CURVE as appropriate.
3. Press the [-] or [+] key to open the clutter curve selection window (default:
STD).
STD
LINEAR CUSTOM
Clutter curve selection window
STD: The higher the clutter level the smaller weak echoes are displayed.
LINEAR: The higher the clutter level the smaller all echoes are displayed.
CUSTOM: Applies the user clutter settings from the user clutter menu. See
page 2-17.
4. Press the [-] or [+] key to choose clutter curve desired.
5. Press the [▲] or [▼] key to close the window.
6. Press the [▲] key to choose HF CLUTTER or LF CLUTTER as appropriate.
7. Press the [-] or [+] key to set clutter rejection level: 0, OFF; 1, weakest,
5, strongest.
8. Rotate the [FUNCTION] switch fully counterclockwise to choose EXIT.
Note: Clutter cannot be adjusted manually when using the auto mode. Turn off
the auto mode on the E/S menu to manually adjust clutter. For details see
page 2-11.