Furuno CSH-53 manual System Menu Description, System menu can be displayed by pressing Menu + c

SYSTEM Menu Description

The SYSTEM menu can be displayed by pressing MENU + c .

Menu	Item	Description
SIGNAL	Smooth Echo Rng	Selects echo smoothing level in range
PROCESS		direction. The higher the number, the higher
		the smoothing effect. The setting range is
		from 0 to 3.
	Smooth Echo Cir	Selects echo smoothing level in circular
		direction. The higher the number, the higher
		the smoothing effect. The setting range is 0 to
		3.
	Delete Color	You can delete undesired echoes and noise in
		certain colors from the display. This is useful
		for eliminating noise and detecting large fish
		schools. The setting range is 0 to 10. If you
		want to delete echoes displayed in colors
		weaker than the 5th weakest color, for
		example, set to 4.
FAR TVG	Far TVG Curve	Selects suitable FAR TVG curve to
		compensate for propagation loss of sound at
		100 m or farther. 30log is the normal setting.
		25log: Suitable for searching small bottom
		fish in shallow water or near coastline.
		30log: Standard setting
		35log and 40log setting also available.
TM DSP	TM Display Range	Selects a display range in the true motion
		display, from 1.3R and 1.6R.
		Note: To enable KP synchronization, open sub
		panel 2, choose TVG/TX and TRANSMIT
		and then set CYCLE to "0".
TARGET LOCK	Tracking Method	This option determines what item to track in
		target lock; target lock mark or fish echo.
	Track Echo Color	Select the weakest color to track in the target
		lock function. The setting range is 1 to 15,
		corresponding to the 16 display colors. 10 is
		the recommended setting, where 10th to 16th
		(reddish brown) color echoes are tracked.
	Tracking Factor	Determine which fish to track, by relative
		echo strength, when multiple fish schools
		appear in the tracking window. 10 is the
		normal setting.
	Disable TGT Lock	Set the number of Tx cycles to search lost fish
		school before quitting target lock.

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