Furuno CSH-5L/CSH-8L manual Measuring Fish School Speed, Entering a fish mark

3. ADVANCED SONAR OPERATION

3.4Measuring 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.

3.4.1Entering 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

Place trackball mark on fish echo and press the [FISH] key.

Wait 1-2 minutes

Past Fish Mark (Max. 8)

2nd Latest Fish Mark

Latest

Fish Mark

X
	FIsh Mark Data
Place trackball mark	Æ1076 (Horizontal range between fish marks)
		787 (Horizontal range from own ship to fish mark)
on fish echo’s latest
		153 (Depth)
location and press the
	S	2.3kt (Speed)
[FISH] key.
	C	E/S (Course*)

* 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.

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