2. HORIZONTAL MODE
2-26
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.
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”.
2. Operate the trackball to place the trackball mark on another fish school and
press the [ESTIMATE 2] key.
3. Compare estimate figures for each fish school by observing estimate mark
data and the fish histogram.
4. To turn off the estimate marks press their respective keys.
N
W
S
E
2000
HEADING
321
°
SHIP COURSE
335
°
SHIP SPEED
12.5kt
LAT/LONG[DGPS]
32
°
52.150N
132
°
12.150E
DEPTH
321m
WATER CURRENT
C1
1.2kt 342
°
C2
0.8kt 298
°
C3
0.4kt 256
°
NET DEPTH
S1
134m
S2
178m
S3
213m
10.3
°
C
WATER TEMP
8
12
10
0
10
20MIN
SCAN
SCAN
1
2
75
North
mark
85
Estimate
mark 1
Estimate mark 1 data
Estimate mark 2 data
Estimate mark 2
1
2
NAV
DATA
DISPLAY
Figure 2-34 Estimate marks and their data
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