JRC JMR-5406-X Instruction Manual page 18

Use the radar only as a navigation aid.
The final navigation decision must always be made by the operator
him/herself.
Making the final navigation decision based only on the radar display
information may cause accidents such as collisions or running aground.
A malfunction as the screen is disordered or unshown may occur if the power
in the ship is instantaneously interrupted during operation of the radar. In this
case, the power should be turned on again.
The simulation function is used exclusively for deciding whether or not target
tracking is properly operating. Therefore, never use this function unless you
wish to check target tracking operations.
Note especially that, if this function is used during actual navigation,
simulated targets are displayed and may become confused with other actual
targets. Therefore, never use this function during actual navigation.
Optimal values have been set for VD Level and Constant; therefore, never
change their values unless absolutely necessary. Failure may result in
accidents that would lower target tracking performance.
When replacing magnetrons, make sure to shut off the main power and let the
equipment stand for more than 5 minutes to discharge the high-voltage
circuit.
Failure may result in electric shock.
Make sure to take off your watch when your hand must get close to the
magnetron.
Failure may result in damage to the watch since the magnetron is a strong
magnet.
Do not make any adjustments during navigation.
Failure may result in adverse effects on the radar function which may lead to
accidents or equipment failure.
Do not change the quantization level settings unless absolutely necessary.
If set at an inappropriate value, the acquisition of target tracking function and
the tracking function deteriorate, and this may lead to accidents.
Do not use or leave the equipment under direct sunlight for a long time or in
the temperatures above 55°C.
Otherwise, a fire or a malfunction may occur.
Do not place a glass or cup containing water, etc., or a small metal object on
this equipment.
If water or such object gets inside, a fire, an electric shock, or a malfunction
may occur.
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