Furuno 1724C, 1734C manual Bottom-zoom display plus normal sounder display, Bottom-lock display

4. VIDEO SOUNDER OPERATION

Bottom-zoom display

The bottom-zoom display expands bottom and bottom fish echoes by the zoom range selected on the SOUNDER RANGE SETUP menu (see paragraph 7.9.3), and is useful for determining 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.

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Bottom		-			-	Zoom marker
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80	30 -		HF
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BOTTOM-ZOOM			NORMAL DISPLAY
DISPLAY

Bottom-zoom display plus normal sounder display

Bottom-lock display

The bottom-lock display provides a compressed normal picture on the right half of the screen and a 10 or 20 feet (3 or 6 meter) 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 7.9.3.

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Fish	8	-			-
school		-			-
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	6	-		50	-
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	4	-			-
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	2	-			-
80	10
		-		100-
	0	-
			HF		-

Zoom marker

This part is zoomed.

BOTTOM-LOCK NORMAL DISPLAY

DISPLAY

Bottom-lock display plus normal sounder display

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