Furuno MODEL CSH-73 manual Main Setting Description Normal Range Sub

Main	Item		Setting	Description	Normal
Item			Range		Setting
	Main	Sub
		NL	0–10	Rejects unwanted echoes.	3
				Automatically reduces receiver
	SIGNAL	AGC	0–10	gain against strong echoes such	0
				as seabed. Adjust so fish echo is
	PROCESS			displayed near seabed.
				Suppresses seabed echoes. If
		2AGC*	0–4	AGC alone cannot suppress	0
				seabed echoes, use 2AGC.
SIGNAL				Selects echo level versus presen-
		CURVE	1–4	tation color curve. The higher	2
				the setting, the easier it is to see
				weak echoes on the screen.
	SIGNAL			Rejects random noise and inter-
		IR	0–3	ference by other echo sounders	0
	PROCESS
				or sonars.
				Adjusts echo afterglow, which is
		AFGLOW	0–4	useful for watching echo move-	0
				ment. The higher the setting the
				longer the afterglow remains.
		RANGE	16	Sets depth range of echo
				sounder picture. Sets range of	160 m
		(DN RNG)	Pos.	net recorder downward
	ES1			sounding.
	(Net
		GAIN	0–10	Adjusts receive sensitivity.	5
	Recorder)
		SHIFT	0–	Sets display start depth of echo
				sounder picture. Sets range of	0 m
ES		(UP RNG)	1000 m
				net recorder upward sounding.
		NL	0–10	Rejects blue dots (caused by	0
				dirty water) on entire screen.
	ES1
				Eliminates echoes displayed in
	(Net	COLOR	0–9		0
				colors specified.
	Recorder)
		IR	ON,	Eliminates interference by other	OFF
			OFF	sonars or echo sounders.
	DELETE			Each pressing erases oldest mark
				among event mark , event
	MARK
				mark , fish mark, own ship
DELETE MK			+ or -	mark.
			key to	Each pressing deletes 1/5 of
	DELETE		erase.	overall length of ship's track. If
				target lock function in on, sixth
	MARK	TRACK
				pressing deletes the fish school
				track and cancels target lock
				mode.

*2AGC and HOR functions cannot be used together. If one is used the other is automatically set to “0”.

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