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Automatic sea clutter control
1. Press the [STC] key once or twice to show
the dialogue shown in Figure 1-8.
AUTO STC MOD
LOW HIGH
1 2 3
Figure 1-8 Dialogue for automatic
adjustment of STC
2. Press or to set level desired: 1, Low; 2,
Normal; 3, High.
Manual adjustment of sea clutter
control
1. Press the [STC] key once or twice to display
the dialogue shown in Figure 1-9.
MAN STC MOD
LOW HIGH
32
Figure 1-9 Dialogue for manual
adjustment of STC
2. Press or to set level desired. 61 levels
are available.
Note: The dialogues for adjusting STC are
automatically erased when there is no TrackDisk
operation for 10 seconds. To erase them quicker,
press the [STC] key after completing the setting.
1.9 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 corner
on the screen when the FTC circuit is on.
Rain clutter
at screen center
FTC adjusted;
rain clutter suppressed
Figure 1-10 Appearance of
rain clutter
1.10 Range Rings
The range rings are the concentric circles around
own ship and they provide an estimated of target
range. The selected range scale automatically
determines the number of rings and their interval
is displayed at the upper-left corner on the
screen.
To turn the range rings on or off, press the [EBL]
and [VRM] keys together.
1.11 Cursor
The cursor is always displayed and functions to
measure the range and bearing to a target.
Operate the TrackDisk to place the cursor on the
inside edge of the target for range or center of
the target for bearing. The range and bearing to
the cursor appear at the bottom right corner on
the display.
Target
Cursor
Range and
bearing to
cursor
045.0°
3.35
NM
6.0
NM
2.0
Figure 1-11 How to measure range and
bearing with the cursor