JRC JMA-3300 Series Instruction Manual page 11

PRECAUTIONS
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.
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.
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.
When using the sea clutter suppression function, never set the
suppression level too high canceling out all image noises from the
rain or snow at close range. Detection of not only echoes from the
rain or snow 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.
Making the final navigation decision based only on the radar
display may cause accidents such as collisions or running
aground.
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