Furuno GP-1850WDF, GP-1850WF manual Erasing Weak Echoes, White Marker

2.VIDEO SOUNDER OPERATION

3.Press ▲ or ▼ to select clutter rejection level desired; 0 (OFF) through 9. The higher the number the greater the degree of suppression. Note that weak echoes may not be displayed when the clutter circuit is on.

4.Press the RETURN soft key and the [SNDR] key to finish.

4.Press the RETURN soft key and the [SNDR] key to finish.

Weak echoes

Appearance of clutter

2.10 Erasing Weak Echoes

Dirty water or reflections from plankton may be painted on the display in green or light blue. These weak echoes may be erased as follows:

1.Press the [MENU] key and the SOUNDER SETUP OPTIONS soft key.

2.Select SIGNAL LEVEL, and press the EDIT soft key to show the signal level window.

Appearance of weak echoes

2.11 White Marker

The white marker functions to display a particular echo color in white. For example, you may want to display the bottom echo (reddish-brown) in white to discriminate fish echoes near the bottom.

1.Press the [MENU] key and the SOUNDER SETUP OPTIONS soft key.

2.Select WHITE MARKER, and press the EDIT soft key to open the white marker window.

WHITE MARKER

▲

3

▼

SIG LVL

▲

OFF

SL1

SL2

SL3

SL4

SL5

SL6

▼

At 16-color display

SIG LVL

▲

OFF

SL1

SL2

SL3

▼

At 8-color display

White marker window

3. Press ▲ or ▼ to select color to display in

white. As you press ▲ or ▼, the number

(corresponds to echo number) in the

marker window changes, the white

marker on the color bar shifts and

selected echo color is displayed in white.

(See page 2-9.)

Signal level window

3.Press ▲ or ▼ to select level of erasure; OFF or signal level among SL1 to SL6 (or SL3). The higher the number the stronger the echo that will be erased.

The white marker setting range is

variable depending on the HUE setting

(see paragraph 2.13) as below.

HUE setting	White marker range
8 color	0-8
16 color	0-16

2-8