![](/images/new-backgrounds/1255746/25574641x1.webp)
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-
1.Press the [▲] and [▼] keys together until the display shown below appears.
WHITE MARKER
▲: UP
▼: DOWN
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.
1.19Fine 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
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.
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