Furuno FCV-620 - Manual (Page 18)

1. OPERATION
9
1. Press the MENU/ESC key to open the menu.
2. Use
S or T to choose Sounder and press
the ENTER key.
3. Use S or T to choose Interference and
press the ENTER key.
Interference setting window
4. Use S or T to choose the degree of sup-
pression desired and press the ENTER key.
Off: Turn off interference rejector.
Low, Medium, High: High provides the
greatest degree of suppression and Low is
the smallest.
Auto: Interference is suppressed automati-
cally.
Note: Turn off the interference rejector when no
interference exists, so as not to miss echoes
from small fish.
5. Press the MENU/ESC key twice to close the
window.
1.12 Suppressing Low Level
Noise
Low intensity "speckles" may appear over most
of screen. This is mainly due to sediment in the
water or noise. These can be suppressed by
adjusting Clutter on the menu.
Clutter appearance
Note: Clutter cannot be adjusted when Fishing
or Cruising is selected on the Auto Gain setting
window.
1. Press the MENU/ESC key to open the menu.
2. Use
S or T to choose Sounder and press
the ENTER key.
3. Use S or T to choose Clutter and press the
ENTER key.
Clutter setting window
4. Use S or T to choose the degree of sup-
pression desired and press the ENTER key.
The setting range is 0 to 100 % in intervals of
ten. The larger the setting value, the greater
the degree of suppression.
5. Press the MENU/ESC key twice to close the
window.
1.13 Erasing Weak Echoes
Sediment in the water or reflections from
plankton may be painted on the display in low
intensity tones.
Appearance of weak echoes
These weak echoes may be erased by using the
“Color Erase”. This function erases weaker
echoes sequentially to show only strong echoes
and clear up the picture.
1. Press the MENU/ESC key to open the menu.
2. Use
S or T to choose Sounder and press
the ENTER key.
3. Use S or T to choose Color Erase and
press the ENTER key.
Off
Low
Medium
High
Auto
Interference
S / T : Select
[ENTER] : Set
[MENU] : Cancel
Clutter
[ENTER] : Set
[MENU] : Cancel
Weak
echoes