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1.18 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 [▲] and [▼] keys together until
the display shown below appears.
▲: UP
▼: DOWN
WHITE MARKER
Figure 1-31 White marker display
2. Press the [▲] or [▼] key to select color
to display in white. As you press the [▲]
or [▼] key, the arrow next to the color
bar shifts and selected echo color is dis-
played in white.
←
Arrow points to
color currently
displayed in white.
Figure 1-32 Color bar when white
marker display is on
To turn the white marker function off, set the
arrow below the weakest color in the color
bar in step 2 of the above procedure.
1.19 Fine Adjustment of Gain in
Dual-Frequency Operation
The gain of the 50 kHz and 200 kHz trans-
ducers can be adjusted individually on the
User menu as follows:
1. Select MENU with the MODE control.
2. Select GAIN ADJ 200kHz or GAIN ADJ
50kHz.
3. Press the [+] or [–] key to adjust gain.