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3. ADVANCED SONAR OPERATION
3-5
3.4 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. If the
tidal current data is used together with fish speed data, you can determine the
timing of the net shooting more efficiently. This function requires speed and
heading inputs.
3.4.1 Entering a fish mark
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 at step 1, and then
press the [FISH] key.
The latest fish mark (
) appears on the target and the 2nd latest fish mark
(
) appears on the location selected at step 1. In addition, the range
between the two fish marks, horizontal range from own ship to the latest fish
mark and the speed and course of the fish school are shown at the bottom
right corner of the sonar display.
Latest
Fish Mark
Latest
Fish Mark
FIsh Mark Data
2nd Latest Fish Mark
Wait 1-2
minutes
C E/S (Course*)
S 2.3kt (Speed)
787 (Horizontal range from own ship to fish mark)
153 (Depth)
X
Past Fish Mark (Max. 8)
Place trackball mark on
fish echo and press the
[FISH] key.
Place trackball mark
on fish echo’s latest
location and press the
[FISH] key.
1076 (Horizontal range between fish marks)
* Course display format may be selected with
EVENT/FISH on the MARKS menu.
** Any value which exceeds 9999 is displayed
with four asterisks (****).
Fish mark and fish mark data
Note 1: Movement is calculated using ship’s speed and heading. Accordingly,
pitching and rolling may affect the calculation. For more accurate
measurement, repeat the procedure two or three times to verify
reliability of the data.
Note 2: The time and distance between pressings of the [FISH] key should be
as long as possible to increase accuracy of measurement. For more
accurate measurement, repeat the procedure two or three times.