1. OPERATION
7
1.7
Adjusting the Gain
The gain may be adjusted automatically
(Fishing or Cruising) or manually. In automat-
ic operation, the gain is automatically adjust-
ed to display the bottom echo in reddish
brown. If you need to lower or higher the gain
in automatic operation, use the gain offset
feature. For manual adjustment, see sec.
1.7.2.
The Gain Area setting on the Sounder menu
determines how gain is adjusted. For setting
details, see Gain Area in sec. 1.19.1.
The “Normal” setting is the conventional gain
adjustment method; the gain setting affects
only echoes after setting.
The “All” setting applies gain to both current
and past echoes.
1.7.1
Selecting gain adjust-
ment
1. Press the [GAIN HF] (for HF) or [GAIN LF]
(for LF) control to open the Auto Gain set-
ting window.
2. Use
S
or
T
to select Fishing, Cruising or
Off as appropriate.
Fishing:
This mode clearly displays
weaker echoes and is for searching fish
schools. "H (L):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 it for
general cruising. "H (L):AC" is shown at
the top left corner on the screen.
Off:
Select to manually adjust gain.
3. For automatic operation (Fishing or Cruis-
ing), use the auto gain offset (range: -5 to
+5) with
W
or
X
.
4. Press the [ENTER] key.
1.7.2
Manual gain adjustment
The [GAIN HF] and [GAIN LF] controls adjust
the sensitivity of the receiver. The setting
range is 0.0 to 10, and the current setting is
shown at the top of the screen as H (or L): XX
(setting value).
Generally, use a higher setting for deep wa-
ters and a lower setting for shallow waters. In
any case, adjust the controls so that a slight
amount of noise remains on the screen.
GAIN: 0
GAIN: 4
The gain setting changed from 0 to 4.
The Gain Area setting is "Normal":
The Gain Area setting is "All":
GAIN: 0
GAIN: 4
The gain setting
changed from 0
to 4.
CAUTION
Adjust the gain properly. Incorrect gain may
give wrong depth indication, which could
result in grounding if the vessel is steered
according to the depth indication.
Gain too high
Gain proper
Gain too low
