JRC JMR-5400 Series, Instruction Manual

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Do not use the offset function during navigation.
If the equipment is used with the offset value entered as the own ship position
(deviated from the actual position), accidents may result.
Change of the colour of the Day/Night button, particularly the use of the
[Night] colour, may interfere with the recognition of display information.
Confirm display information can be recognised.
Do not turn off the power during Backup/Restore.
Otherwise, a function may fail, and an accident may occur.
Do not turn off the power supply during recovery of C drive image.
Otherwise, a function fault occurs, causing an accident.
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.