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2. HORIZONTAL MODE
2-39
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
2nd latest fish mark
WAIT 1-2
MINUTES
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.
FISH MOVEMENT DATA
C 256° (Course)
S 12.3kt (Speed)
2975m
(Horizontal range to fish mark)
153m (Depth)
(Distance moved)
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.