Furuno CSH-5L/CSH-8L - Manual (Page 35)

2. FINE TUNING THE SONAR PICTURE
2-7
2.6 Choosing Beamwidth
2.6.1 Horizontal beamwidth
If you wish to have better bearing discrimination (ability to distinguish two closely
located targets at the same range and different bearings) for fish schools and
also wish to examine the contour of bottom, set HOR BEAMWIDTH to NARROW,
on the SONAR menu.
2.6.2 Vertical beamwidth
For better bearing discrimination in the vertical direction, set VER BEAMWIDTH
to NARROW, on the SONAR menu.
2.7 Deleting Weak Echoes
You can remove weak echoes to clear the picture. Echoes are deleted by
strength so this feature is useful for observing only large fish schools or
suppressing interference.
1. Press the [MENU] key to open the menu.
2. Use the [RANGE] control to choose [MENU MODE] at the top of the screen.
3. Use the [GAIN] control to choose SONAR.
4. Use the [RANGE] control to choose DELETE COLOR.
5. Use the [GAIN] control to choose setting. The setting range is 0-10 and the
higher the number the stronger the echo that will be erased.
6. Press the [MENU] key to close the menu.
2.8 Echo Averaging
You may adjust echo afterglow to follow echo movement. The higher the setting
the longer the afterglow remains on the screen.
1. Press the [MENU] key to open the menu.
2. Use the [RANGE] control to choose [MENU MODE] at the top of the screen.
3. Use the [GAIN] control to choose SONAR.
4. Use the [RANGE] control to choose ECHO AVERAGE.
5. Use the [GAIN] control to choose setting. The setting range is 0 (OFF) to 3
and the higher the setting the longer echoes remain on the screen.
6. Press the [MENU] key to close the menu.