1. OPERATION
5
1.5 How to Select a
Range
The basic range may be selected in the [Auto]
or [Manual] mode.
Note: The RANGE key is inoperative when
the bottom discrimination feature is active.
1. Press the RANGE key to open the
[Range] setting window.
2. Use W or X to select [Auto] or [Manual].
[Auto]: The range changes automatically
to display the bottom echo on the screen
always. (The shift function is inoperative
in the auto mode.) [AUTO_R] is shown at
the top left corner on the screen. Note that
the deepest detection range of Auto
Range is the largest setting of [Range 1]
to [Range 8] of Manual Range. In case
the sea bottom is deeper than the largest
setting of Auto Range, set the setting of
[Range 1] to [Range 8] deeper than the
sea bottom.
[Manual]: The range may be selected
from the eight ranges listed below.
[MAN_R] is shown at the top left corner
on the screen.
If you selected [Auto], go to step 4.
For [Manual], go to the next step.
3. For [Manual], use the RANGE key (or S
or T) to select the range.
*: Japanese unit of depth measurement
Note: Basic ranges may be preset as de-
sired. For further details, see section 2.2.
4. Press the ENTER key.
Note: The range mode indication, which ap-
pears at the top-left corner, may be turned on
or off with [Header Info] on the [Display]
menu. For details, see [Header Info] on page
23.
1.6 How to Adjust the
Gain
How to select the gain adjustment mode
The gain may be adjusted automatically
([Fishing] or [Cruising]) or manually. In auto-
matic 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.
For manual gain adjustment, adjust the gain
according to signal strength.
These are
available with
Manual mode.
CAUTION
Adjust the gain correctly.
Incorrect adjustment can lead to a dangerous
situation if the boat is steering according to the
depth indication.
Unit
Basic Range
1
2
3
456 7
8
1000
600
400
200120603015
300
200150
80
40
2010
5
m
ft
fm
150
100
80
40
2010
5
3
pb
200
150
100
20
501053
HR*
200
150
1005030
15
84
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