1. OPERATIONAL OVERVIEW
1-11
V1 and V2 modes
The V1 and V2 modes show a vertical slice of the bearing selected by the vertical
bearing mark on the horizontal display. The vertical 2 mode provides two vertical slic-
es. For further details, see chapter 3.
Vertical mode
1.6 How to Adjust the Gain
The GAIN control adjusts receiver gain (sensitivity) for the horizontal, slant and verti-
cal modes. Adjust it so fish echoes are clearly displayed with minimal noise on the
screen. Too high a gain setting not only displays excess noise and makes it difficult to
discriminate wanted echoes but also causes bottom echoes to be painted in strong
colors, resulting in echoes being masked by bottom reflections. Normally, set the con-
trol somewhere between positions 3 and 7.
1. If the horizontal and vertical modes are active, press the H/V/S key to show the
range and gain indications of the mode you wish to adjust. Pressing the H/V/S key
changes the color of the range and gain indications to orange.
• H1/H2: Horizontal1 or horizontal2
• H/S: H or S display
• V1/V2: H or V display
2. Adjust the GAIN control.
New gain setting is momentarily displayed in large characters at the top of each dis-
play. The setting value is always displayed next to “G“. (For the vertical display, the
gain indication is shown at the bottom of the display.)
Note: The gain can also be adjusted from the gain indication. Put the cursor on the
gain indication to highlight it in yellow then roll the scrollwheel.
NUMERIC/
GRAPHIC
DATA
DISPLAY
NUMERIC/
GRAPHIC
DATA
DISPLAY
V1 mode
V1 & V2 mode
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