4. VIDEO SOUNDER OPERATION

4.4Manual Sounder Operation

Manual operation is useful for observing fish schools and bottom using a fixed gain setting.

The gain, range and range shift functions used together give you the means to select the depth you can see on the screen. The basic range can be thought of as providing a “window” into the water column and range shifting as moving the “window” to the desired depth.

4.4.1Selecting the manual mode

1.If not displayed, press the [HIDE/SHOW] key to show the sounder soft keys.

2.Press the B:AUTO/D. BOX soft key to show the mode/frequency window.

3.Select OFF (MANUAL).

4.Press the E:RETURN soft key.

4.4.2Selecting display range

Press the [RANGE +] or [RANGE -] key to select a range. The default ranges in feet, meters, fathoms and passi/braza are as below. Note that the range cannot be changed in the automatic sounder mode.

Default sounder ranges

Range 1

Range 2

Range 3

Range 4

Range 5

Range 6

Range 7

Range 8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ETR-6/10N

ETR-30N

 

 

 

 

 

 

 

 

 

15 ft

30 ft

60 ft

120 ft

200 ft

400 ft

1000 ft

4000 ft

4500 ft

 

 

 

 

 

 

 

 

 

5 m

10 m

20 m

40 m

80 m

150 m

300 m

1200 m

1500 m

 

 

 

 

 

 

 

 

 

3 fa

5 fa

10 fa

20 fa

40 fa

80 fa

150 fa

650 fa

900 fa

 

 

 

 

 

 

 

 

 

3 P/B

5 P/B

10 P/B

30 P/B

50 P/B

100 P/B

200 P/B

700 P/B

900 P/B

 

 

 

 

 

 

 

 

 

4.4.3Adjusting the gain

Normally, set the gain to the point where excessive noise does not appear on the screen. Use a higher gain setting for greater depths and a lower setting for shallow waters.

Gain too high

Gain proper

Gain too low

Examples of proper and improper gain

4-10

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Page 152
Image 152
Furuno 1943C-BB, 1953C-BB Manual Sounder Operation, Selecting the manual mode, Selecting display range, Adjusting the gain