4. SLANT MODE
4-26
4.17 How to Measure the Speed of a School of Fish
To ensure a good haul, it is important to estimate the direction and speed of the school
of fish 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 effi-
ciently. This function requires speed and heading data.
4.17.1 How to measure the speed of a school of fish
1. Place the cursor on the center of a school of fish then press the FISH key or push
the left-click button. The latest fish mark ( ) appears on the school of fish.
2. Wait until the target fish moves a reasonable distance from the latest fish mark.
3. Place the cursor on the same school of fish selected in step 1 then 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 the depth, speed, course, and bear-
ing of the school of fish appear at the bottom right-hand corner of the horizontal
display area.
Note 1: The time and distance between each press 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 2: Each time the FISH key is pressed the latest fish mark and ship's speed
mark change in the sequence shown below. A maximum of 20 fish marks can be
entered. When you enter more than 20, the earliest fish mark is erased.
Latest fish mark
Latest fish mark
2nd latest fish mark
WAIT A FEW
MINUTES
X
Earlier fish mark (Max. 18)
FISH MOVEMENT DATA
C
B
256
°
(Course)
235
°
(Bearing)
S 12.3kn (Speed)
2975m
(Horizontal range to fish mark)
153m (Depth)
(Distance moved)
Place the cursor
on a school of fish and
press [FISH] key.
Place the cursor
on the school of fish’s
current location and press
[FISH] key again.
key pressed once
twice
three times
four times
[FISH]
This data is the latest fish
mark data.
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