Furuno CH-270 - Manual (Page 37)

2. HORIZONTAL MODE
2-17
2.11.4 Erasing weak echoes
Weak echoes such as interference can be erased from the screen. This is useful when
you want to observe a fish school echo.
1. Press the [MENU] key to open the menu.
2. Press ▲ to choose MENU.
3. Press ◄ or ► to choose COM2.
DELETING TRACK NO
WHITE MARKER OFF
SIG LEVEL OFF
COLOR 16
BKGD COLOR 2
: SELECT : CHANGE MENU: END
MENU COM1 HORZ VERT ES SHORT-CUT SYS COM2
COM 2 menu
4. Press ▲ or ▼ to choose SIG LEVEL.
5. Press ► to open the dialog box.
SIG LEVEL
OFF 1 14
(OFF, 1-14)
OFF
8-color display: OFF, 1-6
16-color display: OFF, 1-14
Signal level dialog box
6. Press ◄ or ► to choose echo color to erase. Pressing ► erases echoes from weak to
strong in ascending order of strength. You can see which echo color is erased by
watching the color bar.
7. Press the [MENU] key to register your selection and close the menu.