Furuno FSV-35 Operator's Manual page 79

3. VERTICAL MODE
3. Press the H/V/S key to select the [V] tab.
4. Select [Noise Limiter] then push the left-click button.
5. Select S or T then push the left-click button to set the value (setting range: 0 to
15).
6. Select [Quit] on the setting box then push the left-click button to close the box.
7. Long-press the MENU/ESC key to close all menus.
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