Safety Instructions on Target Tracking (TT)
⚠
WARNING
This function is not a substitute for safety
monitoring using human vision and
human judgment. It is intended to aid the
monitoring of courses for the safe
navigation of vessel. Relying too much on
the monitoring function or incorrect use
of the function can end up incurring
danger. Pay sufficient attention to the
following points.
Depending on the radar setting, targets
are not acquired or unwanted targets
such as sea clutter are tracked. In some
cases, radar settings may be
inappropriate for this function. Adjust
each knob of radar according to each
situation.
A target may not be properly acquired or
tracked when sea clutter or rain clutter is
strong and wide, when the target is in low
clouds or when there is too much
interference or noise.
Adjust the sea clutter or rain clutter
controls to suppress them on the screen.
Be careful not to lower the gain or
suppress the sea clutter too much to
make sure that necessary targets are not
eliminated from the radar screen.
CAUTION
About plotting accuracy
The plotting accuracy and response speed of
this TT meet the International Maritime
Organization (IMO) standards. Tracking
accuracy is affected by the following.
Tracking accuracy is not affected by slow
course change of own ship. However, abrupt
course change affects all tracking targets and
one to two minutes is required to restore full
accuracy for those targets. (The degree of
impact depends on gyrocompass.)
When the relative speed of other ship is high,
target course display is delayed by 15 to 30
seconds.
When the relative speed of other ship is low
(close to 0), target course display is delayed by
30 to 60 seconds.
The accuracy slightly drops during course
change but soon recovers.
About display accuracy
The display accuracy may be affected by the
following.
1) Fluctuation of radar reflection intensity
2) Fluctuation of radar reception pulse length
3) Bearing error caused by radar
4) Bearing error caused by heading sensor
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SAFETY INSTRUCTIONS
