Furuno Ls4100 manual How white line works, Deep Gain

4.Use ▲ or ▼ to choose Off, Tone or Mesh as appropriate. “Mesh” paints the white line in darker tone than “Tone.”

5.Press the [MENU/ESC] key to close

the menu.

50k	1/1	50k	1/1
0.0	0		0

	20	Fish school	20
		clearly shown
	40		40
		White line
	60		60
52.6	80	52.6	80
White Line OFF		White Line ON (Mesh)

How white line works

DEEP GAIN

“Deep Gain” compensates for propagation attenuation of the ultrasonic waves. It does this by equalizing echo presentation so that fish schools of the same size appear in the same density in both shallow and deep waters. In addition, it reduces surface noise.

1. Press the [MENU/ESC] key to open the main menu.

2.Use ▲ or ▼ to choose DEEP GAIN from page 1 of the menu.

3.Press ► to show to the options window.

4.Choose Low, Medium, or High as appropriate. High provides the greatest degree of gain reduction against short range echoes.

5.Press the [MENU/ESC] key to close the menu.

Page 2

TRIP RESET

This item resets trip distance to “0.”

1. Press the [MENU/ESC] key to open the main menu.

2.Use ▲ or ▼ to choose TRIP RESET? from page 2 of the menu.

3.Press ►.

4.Press ▲ to reset trip distance. Beeps are generated while the trip distance is being reset.

5.Press the [MENU/ESC] key to close the menu.

Note: To reset the odometer to zero, clear the memory.

GAIN ADJ 200, GAIN ADJ 50

If the gain is too high or too low, or the gain for the low and high frequencies appears unbalanced, you can compensate it as follows:

1. Press the [MENU/ESC] key to open the main menu.

2.Use ▲ or ▼ to choose GAIN ADJ 200 or GAIN ADJ 50 from page 2 of the menu.

3.Press ► to show to the options window.

4.Use ▲ or ▼ to set the amount. The setting range is –50 to +50.

5.Press the [MENU/ESC] key to close the menu.

DRAFT

The default depth display shows the distance from the transducer. If you would rather show the distance from the sea surface, set your ship’s draft as follows:

1. Press the [MENU/ESC] key to open the main menu.

2.Use ▲ or ▼ to choose DRAFT from page 2 of the menu.

3.Press ► and then use ▲ or ▼ to set draft. The setting range is –15.0 to +50.0 (meters, feet).

4.Press the [MENU/ESC] key to close the menu.

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