JRC JMA-5212-4, User Manual

Page: 15 / 494

- ix -
Any adjustments must be made by specialized service
personnel.
Incorrect settings may result in unstable operation.
Do not make any adjustments during navigation. Failure
to comply may result in adverse effects on the radar
function which may lead to accidents or equipment
failure.
When a small value is set as a hysteresis condition, a
tracked target near an AIS target is identified as the AIS
target and may thus disappear from the display.
For example, when a pilot vessel equipped with the AIS
function (a small target which is not a tracked target)
goes near a cargo vessel which is a tracked target
without the AIS function, the tracked target symbol for the
cargo vessel may disappear.
Since these alarms may include some errors depending
on the target tracking conditions, the navigation officer
himself should make the final decision for ship
operations such as collision avoidance.
Making the final navigation decision based only on the
alarm may cause accidents such as collisions.
CAUTION
When setting a automatic acquisition zone, make sure to
properly adjust gain, sea-surface reflection suppression
level, and rain/snow reflection suppression level so that
the optimal target images are always on the radar screen.
The automatic acquisition zone alarm will not be
activated for targets undetected by the radar, and it may
result in accidents such as collisions.
Optimal values have been set for Video Level and Vector
Constant; therefore, never change their values unless
absolutely necessary. Failure to comply may result in
accidents that would lower target tracking performance.