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Furuno 1712 Manual

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7
Manual adjustment of sea clutter
control
1. Press the [STC] key once or twice to display
the dialog box shown in Figure 2-9.
MAN STC MOD
LOW HIGH
32
Figure 2-9 Dialog box for manual
adjustment of STC
2. Press
or to set level desired. 61 levels
are available.
Note:
The dialog boxes for adjustment of STC
are automatically erased when there is no
Omnipad operation for 10 seconds. To erase
them quicker, press the [STC] key after
completing the setting.
2.9 Suppressing Rain Clutter
In adverse weather, clouds, rain or snow
produce spray-like spurious echoes which
impair target detection over a long distance.
These echoes can be suppressed by turning on
the [FTC] key. FTC appears at the top right-
hand corner on the screen when the FTC
function is on.
Rain clutter
at screen center
FTC adjusted;
rain clutter suppressed
FTC
Figure 2-10 Appearance of rain clutter
2.10 Range Rings
The range rings are the concentric circles
around own ship and they provide an estimate
of target range. The selected range scale
automatically determines the number of rings
and their interval is displayed at the upper-left-
hand corner on the screen.
To turn the range rings on or off, press the [EBL]
and [VRM] keys together.
2.11 Cursor
The cursor is always displayed and functions to
measure the range and bearing to a target.
Operate the Omnipad to place the cursor on the
inside edge of the target for range measurement
or the center of the target for bearing
measurement. The range and bearing to the
cursor appear at the bottom right-hand corner
on the display.
Target
Cursor
Range and
bearing to
cursor
045.0°
3.35
NM
6.0
NM
2.0
Figure 2-11 How to measure range and
bearing with the cursor
… 15 …


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