JRC JMA-1032 Instruction Manual page 14

PRECAUTINS
If sensitivity is set too high, unnecessary signals such as noises in
the receiver and false echoes increase to lower target visibility.
At the same time, if sensitivity is set too low, detection of targets
such as ships and dangerous objects may be hindered.
Therefore, sensitivity must always be set to an optimal level.
Making the final navigation decision based only on the radar display may cause
accidents such as collisions or running aground.
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CAUTION
A malfunction 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.
Always use the automatic tuning mode.
Use the manual tuning mode only when the automatic tuning
mode does not provide the best tuning state due to deterioration
of magnetron for example.
When using the sea clutter suppression function, never set the suppression
level too high canceling out all image noises from the sea surface at close
range. Detection of not only echoes from waves but also targets such as other
ships or dangerous objects will become inhibited.
When using the sea clutter suppression function, make sure to choose the
most appropriate image noise suppression level.
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 may
cause accidents such as collisions or running aground.
Use the target tracking function (TT) 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 target tracking function
(TT) information may cause accidents.
The target tracking function (TT) information such as vector, target numerical
data, and alarms may contain some errors. Also, targets that are not detected
by the radar cannot be acquired or tracked.