Furuno FSV-84 manual Measuring Fish School Speed

4. SLANT MODE

4.17Measuring 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.

4.17.1Entering 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.

Earlier fish mark (max. 8)

Latest fish mark

WAIT 1-2

MINUTES

Place trackball mark on a fish school and press [FISH] key.

2nd latest fish mark

Latest fish mark

X
	FISH MOVEMENT DATA
Place trackball mark		(Distance moved)
		2975m (Horizontal range to fish mark)
on fish school's current		153m (Depth)
location and press
	S 12.3kt (Speed)
[FISH] key again.
	C	256° (Course)

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.

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