Furuno CHS-5LMARK-2-55, Operator'S Manual

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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 lo-
cated targets at the same range and different bearings) for schools of fish 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 schools of fish or suppressing interfer-
ence.
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.