Furuno GP-1850DF, GP-1850F manual Erasing Weak Echoes, White Marker

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 soft key

SOUNDER SETUP OPTIONS.

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

2.11 White Marker

The white marker functions to display a par- ticular echo color in white. For example, you may want to display the bottom echo (red- dish-brown) in white to discriminate fish ech- oes near the bottom. Note that the bottom must be displayed in reddish-brown for the white marker to function.

1. Press the [MENU] key and the soft key

SOUNDER SETUP OPTIONS.

SIG LVL

▲

'OFF ™SL1 ™SL2 ™SL3 ™SL4 ™SL5

™SL6

▼

At 16-color display

SIG LVL

▲

'OFF ™SL1 ™SL2

™SL3

▼

At 8-color display

2. Select WHITE MARKER, and press the

soft key EDIT to open the white marker

window.

WHITE MARKER

▲

3

▼

Figure 2-26 White marker window

(See page 2-9.)

Figure 2-24 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 stron- ger the echo will be erased.

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

Weak echoes

Figure 2-25 Appearance of weak echoes

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. When you select 8 in HUE window (See page 2-9.), white marker is among 0 to 8.

White marker shows

← color currently displayed in white.

Figure 2-27 Color bar when white

marker function is active

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

To turn the white marker function off, display “0” in the white marker window.

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