Furuno FSV-84 manual Comparing Fish School Concentration

5. ECHO SOUNDER MODE

5.8Comparing Fish School Concentration

You can get an estimate of the volume of two fish schools by using the two ESTIMATE keys as below. You may use these keys in the ES1 and ES2 modes.

1.Use the trackball to set the trackball mark at the center of fish school and press the [ESTIMATE 1] or [ESTIMATE 2] key. The beginning and ending depths are marked with dashed lines. A circle with the number 1 or number 2 inside is displayed, shown by a dashed line.

Note: The processing range, that is, the area between the dashed lines, can be selected with ESTIMATE ON ES in the MARK SIZE menu. The choices available are 1/8 (default setting), 1/4 and 1/2, of the echo sounder display range.

2.Observe the fish histogram. See next page.

3.To turn off the estimate mark, press the [ESTIMATE 1] or [ESTIMATE 2] key whichever was pressed at step 1.

W

Fish histogram (Automatically appears when

Fish estimate mark estimate mark is active. See next page.)

N	FISH HISTOGRAM	WATER CURRENT*
1	ES	C1	1.2kt	342°
		C2	0.8kt	298°
		C3	0.4kt	256°
2	ES	NET DEPTH*
		S1	134m
		S2	178m
		S3	213m
				0

EE	40
1	Fish school concentration￿
	is calculated for echoes￿
	within the beginning and￿
	ending depths

80

S

Estimate mark 1

Estimating fish concentration with estimate marks

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