Furuno MODEL CSH-73 manual Control Function

Control	Function
NORM, E/S, HIST	Select display mode: NORM, normal sonar picture; E/S, Echosounder
(Mode keys)	combination; HIST, Historical display.
	Lamp above a key lights to show current selection.
RECALL, MEMO	RECALL: Replays saved picture.
	MEMO: Saves picture to memory card or internal memory.
RANGE	Selects a picture display range. Range selected appears on the display.
GAIN	Adjusts receiver sensitivity.
TRAIN	Rotates the transducer. The center of the sounding beam can be
	oriented in any direction between 165° port and 165˚ starboard.
AUTO TRAIN	Press AUTO TRAIN to train the transducer automatically within
WIDTH	±30°, ±60°, ±90° or ±120° sector as selected with the WIDTH key.
	The lamp above the switch lights during the automatic training
	operation.
TILT	Changes the tilt angle of the sounding beam between 0°and 90°.
AUTO TILT,	Automatically tilts the sounding beam up and down in 2° steps within
WIDTH	the tilt angle selected by the WIDTH key. The lamp above the key
	lights when automatic tilt is on.
NET COURSE	Marks location of net.
TARGET LOCK	Tracks a fish school.
EVENT ,	Inscribe event mark on the display, to find horizontal range, depth and
	bearing to a target. Note that the EVENT key can function the
	same as the SHOOT key of the remote control box. This can be done
	on OTHER sub-menu in the INIT/SET menu
ESTIMATE 1, 2	Compares volume of two fish schools.
FISH	Measures fish school speed.
OFF-CENT	Relocates selected target.
DIM	Adjusts the backlighting of the control panels and the brightness of
	the lamps above keys.
CONT	Adjusts screen contrast.
BRILL	Adjusts screen brilliance.
AUDIO	Adjusts volume of built-in loudspeaker, which monitors a target
	appearing along the bearing marker.
TRACKBALL	Follows on-screen movement of trackball mark, to enter marks and
	off-center the screen.

1-3