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2. HORIZONTAL MODE
2-38
2.16 Comparing Fish School Concentration
You can get an estimate of the volume of two fish schools by using the two
ESTIMATE keys as follows:
1. Operate the trackball to place the trackball mark on a fish school, and then
press the [ESTIMATE 1] key.
2. The estimate mark appears on the fish school. Relative volume is shown by a
figure between 0 and 100, below the estimate mark. When the area inside
the mark is filled in reddish brown, volume figure is said to be “100”.
3. Operate the trackball to place the trackball mark on another fish school and
press the [ESTIMATE 2] key.
4. Compare estimate figures for each fish school by observing estimate mark
data and the fish histogram.
5. To turn off the estimate marks press their respective keys.
N
W
S
E
°
°
°
°
°
°
°
°
SCAN
SCAN
1
35
North
mark
Estimate
mark 1
Estimate mark 1 data
Estimate mark 2 data
Estimate mark 2
1
2
NUMERIC/
GRAPHIC
DATA
DISPLAY
2
85
Estimate marks and their data