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1. Press the [MENU/ESC] key to open the
menu.
2. Press ▲ or ▼ to choose A-SCOPE
from page 1 of the menu.
3. Press ► to show the options window.
4. Press ▲ or ▼ to choose the A-scope
presentation type desired.
Normal: Display shows echoes at each
transmission with amplitudes and tone
proportional to their intensities
Peak: Peak-hold amplitude picture.
5. Press the [MENU/ESC] key to close the
menu.
6. To turn off the A-scope display,
choose Off at step 4 and then press the
[MENU/ESC] key.
1.11 Suppressing
Interference
Interference from other acoustic equipment
operating nearby or other electronic
equipment on your boat may show itself on
the display as shown in the figure below.
To suppress interference, do the following:
1. Press the [MENU/ESC] key to open the
menu.
2. Use ▲ or ▼ to choose NOISE LIMIT
from page 1 of the menu.
3. Press ► to show the options window.
4. Use ▲ or ▼ to choose the degree of
suppression desired; Off, Low, Medium,
or High (highest).
5. Press the [MENU/ESC] key to close the
menu.
Interference from
other sounder
Electrical interference
Forms of interference
Turn the noise limiter off when no
interference exists, otherwise weak echoes
may be missed.
1.12 Suppressing Low
Level Noise
Low intensity “speckles” may appear over
most of screen. This is mainly due to
sediment in the water or noise. These can
be suppressed by adjusting CLUTTER on
the menu. When the automatic mode is on,
clutter is automatically rejected. To
suppress low level noise in manual sounder
operation, do the following:
1. Press the [MENU/ESC] key to open the
menu.
2. Use ▲ or ▼ to choose CLUTTER from
page 1 of the menu.
3. Press ► to show the options window.
4. Use ▲ or ▼ to choose the degree of
suppression desired; 1, 2, 3 ,4, 5 or 6.
The higher the number the greater the
suppression.
5. Press the [MENU/ESC] key to close the
menu.
6. To turn off low-level noise
suppression, choose Off at step 4 and
then press the [MENU/ESC] key.
Clutter appearance