2. HORIZONTAL MODE
2-27
2.17 Measuring Fish School Speed
To ensure a good haul, it is important to estimate the direction and speed of the
fish school before shooting the net. You can do this with the [FISH] key. With
tidal current data plus fish speed data, you can determine the timing of the net
shooting more efficiently. This function requires speed and heading data.
2.17.1 Entering
fish
marks
1. Place the trackball mark on the center of a fish school, and then press the
[FISH] key. The latest fish mark (
) appears on the fish school.
2. Wait 1 to 2 minutes.
3. Place the trackball mark on the same fish school selected in step 1 and
press the [FISH] key. The latest fish mark appears on the target, the 2nd
latest fish mark (
) appears on the location selected at step 1 and any
earlier fish marks are shown with an “X”. The distance between the two fish
marks and fish school course and speed appear at the bottom right-hand
corner of the horizontal display area.
Latest fish
mark
Latest
fish mark
FISH MOVEMENT DATA
2nd latest fish mark
WAIT 1-2
MINUTES
C
256˚ (Course)
S 12.3kt (Speed)
2975m (Distance moved)
153m (Depth)
X
Earlier fish mark (max. 8)
Place trackball mark
on a fish school and
press [FISH] key.
Place trackball mark
on fish school's current
location and press
[FISH] key again.
(Horizontal range to fish mark)
Figure 2-35 How to measure fish school speed
Note 1:
Fish
movement is calculated using ship’s speed and heading data.
Accordingly, pitching and rolling may affect the calculation. For best
results, try the procedure two or three times to verify reliability.
Note 2:
The time and distance between pressings of the [FISH] key should be
as long as possible to increase accuracy of measurement. For best
results, repeat the procedure two or three times.
Note 3:
Each time the [FISH] key is pressed the latest fish mark and ship’s
speed mark change in the sequence shown below.
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