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The reference target function is to be used if the own ship's speed cannot be
displayed normally due to trouble such as a speed sensor malfunction. Do not
use the reference target function except in emergencies.
Do not set as a reference target a large radar echo such as a land target. The
vectors of the speed and other tracking targets will not be displayed correctly
and may cause an accident.
Do not set as a reference target a sailing ship. The vectors of the speed and
other tracking targets will not be displayed
correctly and may cause an
accident.
Do not use own speed based on reference target tracking for relative speed
and CPA/TCPA calculation of AIS targets because the response of own speed
is slower than actual own ship's speed change and it may cause a big error
on the collision judgement of AIS targets.
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