JRC JMR-92 Series Field Service Manual page 21

During sailing, be sure to check the own ship's position and bearing as often
as necessary, regardless of whether the automatic sailing is in operation or
not.
Otherwise, accidents may result.
Do not turn off the power during Backup/Restore.
Otherwise, a function may fail, and an accident may occur.
Do not do the backup operation of data while sailing.
The radar application should be ended to begin the data backup. It becomes
impossible to observe using radar and this may lead to accidents.
Since the image within the previous observation range is displayed by
expanding/contracting for the period from immediately after switching of the
observation range from the next image updating, do not use this image for
navigation.
If this image is used for navigation, an accident may occur.
In the case of turning on the power under the condition of low temperature, do
pre-heat more than 30 minutes.
Otherwise, an operation failure may occur and an accident may occur.
Normally, use the automatic tuning mode.
If you use the manual tuning mode, an accident may be caused by a
transmission/reception problem.
Use the manual tuning mode only when you cannot bet the best tuning
conditions in the automatic tuning mode.
Always keep the sensitivity adjusted to the best condition.
If you raise the sensitivity excessively, the visibility of the target will be
reduced by unwanted signals including receiver noise and pseudo image.
This may cause an accident.
If the sensitivity is reduced excessively, detection of a target such as a ship or
hazardous material will be interrupted.
Adjust the preset of the observation scene according to the oceanographic
condition, with the thorough understanding of the features of the radar signal
processing setting. The optimum radar performance may not be able to be
demonstrated due to the contents of the changed setting or the
oceanographic condition at that time.
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