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2.18
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 keys. With tidal current
data plus fish speed data, you can determine the timing of the net shooting more effi-
ciently.
This function requires appropriate data input. For details, see "DATA INPUT
REQUIREMENTS" on page AP-12.
There are two types fish marks available: FISH1 (
marks can be entered.
2.18.1
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 (
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 bearing of the school of fish appear at the bottom right-hand corner of the hor-
izontal display area.
Latest fish mark
Place the cursor
on a school of fish and
press [FISH] key.
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: With factory default settings, you can use the right button to enter a fish
mark.
Note 3: Each time the FISH key is pressed the latest fish mark and ship's speed
mark change in the sequence shown in the following figure. When you enter more
than 20, the earliest fish mark is erased.
2nd latest fish mark
WAIT A FEW
MINUTES
X
Place the cursor
on the school of fish's
current location and press
[FISH] key again.
) and FISH2 (
or
) appears on the school of fish.
Latest fish mark
Earlier fish mark (Max. 18)
FISH MOVEMENT DATA
(Distance moved)
(Horizontal range to fish mark)
2975m
153m (Depth)
S 12.3kn (Speed)
C
256° (Course)
B
235° (Bearing)
2. SLANT MODE
). Up to 20
or
)
2-31
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