Furuno CH-250 - Manual (Page 17)

1-7
1.7 Adjusting the Gain
The [GAIN] control adjusts the sensitivity of the receiver. Normally, the control is adjusted so
that the bottom echo is displayed in reddish-brown mixed with red. Initially set the gain between
“4” and “6” and then fine tune depending on fishing ground, etc.
Too Low Proper Too High
Figure 1-5 How to adjust the gain
1.8 Basic Menu Operation
The menu, consisting of six menus, mostly contains items which once preset do not require
frequent adjustment. Below is the procedure for basic menu operation.
1. Press the [MENU] key to open the menu.
Note:
Either PRESET (default setting) or SHORT-CUT appears between ES and SYS at
the top of the screen depending on the setting of CUSTOM KEY on the SYSTEM
SETTING 1 menu, and they set the function of the custom keys [1], [2], [3]. For
further details see pages 5-3 through 5-7.)
DELETING TRACK NO
WHITE MARKER OFF
SIG LEVEL OFF
COLOR 16
BKGD COLOR 2
: SELECT : CHANGE MENU: END
MENU COM1 HORZ VERT ES PRESET SYS COM2
Figure 1-6 COM2 menu