Furuno 1752C Bottom-lock display plus normal sounder display, Bottom discrimination display

4. VIDEO SOUNDER OPERATION

Bottom-lock display

The bottom-lock display provides a compressed normal picture on the right half of the screen and a 3 or 6 meter (10 or 20 feet) wide layer in contact with the bottom is expanded onto the left half of the screen. This mode is useful for discriminating bottom fish from the bottom echo. You may select the bottom lock range from the SOUNDER RANGE SETUP menu. For details, see paragraph 5.9.3.

	-		0-
	20			-	Zoom marker
	15	This part
		is zoomed.		-
	-			-
	-		50	-
	60
				-
Fish	-
school	10			-
	10			-
80	-		100-
	5
		HF		-

BOTTOM-LOCK NORMAL DISPLAY

DISPLAY

Bottom-lock display plus normal sounder display

Bottom discrimination display

The bottom discrimination mode displays the bottom echo to help you determine bottom hardness. A bottom displayed with a short echo tail usually means it is a soft, sandy bottom. A long echo tail means a hard bottom.

Bottom trail

Long tail=Hard bottom Short tail=Soft bottom

	-			-
	4-	20.0
	-			-
	-			-
	-
	2 -		50	-	Zoom marker
	-
	-
	0
	-
	-		100	-
80	50
	-	HF		-
BOTTOM		NORMAL DISPLAY
DISCRIMINATION
DISPLAY

Bottom discrimination display

4-6