Furuno 1824C manual Bottom discrimination display, Scope display display only

4. VIDEO SOUNDER OPERATION

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 tail

Long tail = Hard bottom Short tail = Soft bottom

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

Bottom discrimination display

A-scope display (display only)

The A-scope display, available in all modes, shows echoes at each transmission with amplitudes and tone proportional to their intensities, on the right 1/10 of the screen. It is useful for estimating fish species and bottom composition. To turn on the A-scope display, press the DISPLAY MODE soft key, select display mode desired, then press the A-SCPE soft key to show “ON” on its label. For modes other than SINGLE FREQ the screen must be split horizontally to show the A-scope display.

	0 -
	-
	-
	-
	50 -
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84	100 --
	-
HF

A-scope display

No response

Weak echo (fish)

Strong echo (bottom)

SINGLE FREQ DISPLAY A-SCOPE DISPLAY

A-scope display

4-5