1. OPERATION
1-13
1
1.7 How to Adjust the Gain
The gain may be adjusted automatically ([Fishing] or [Cruising]) or manually.
Automatic adjustment
In automatic adjustment, the range is automatically selected to display the bottom
echo in reddish brown. The automatic gain setting can be fine tuned with the offset
gain feature. Clutter and TVG are also adjusted automatically when automatic gain is
active.
1. Press the GAIN key to open the [Auto Gain] setting window.
2. Rotate the KNOB to select [Fishing] or [Cruising].
You can also press the GAIN key to select the desired mode.
[Fishing]: This mode clearly displays weaker echoes and is useful for searching
for schools of fish. "G:AF" is shown at the top left corner on the screen.
[Cruising]: This mode clearly displays stronger echoes (for example, bottom) and
suppresses weak echoes. Use this mode for general cruising. "G:AC" is shown at
the top left corner on the screen.
Note: If the header is not displayed, set [Header Info] to [On] in the [Display] menu
(see page 1-52).
You can apply an offset to the gain, at step 3. To apply no offset, go to step 4.
3. Press or (setting range: -5 to +5) to apply an offset. Press to decrease the
offset; to raise the offset.
4. Press the KNOB. The new gain setting is also applied to past echoes.
Manual adjustment
For manual gain adjustment, adjust the gain according to signal strength. For dual fre-
quency display, gain can be adjusted by frequency.
Adjust the gain correctly.
If the value of the gain setting is too small, weak
signals will be suppressed and no indication
appears. If the value is too large, noise will fill
the screen and the indication will be difficult to
distinguish. It is dangerous to use the depth
display as a reference when operating the
vessel without a clear indication of the seabed.
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