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3
RADAR OPERATION
ATA (Automatic Tracking Aid) and AIS (Automatic Identification System)
■
By automatically tracking the target, the Closest Point of Approach (CPA) and the Time to Closest Point of Ap-
proach (TCPA) limit of a own ship and a target are calculated.
ATA and AIS tells about to alarm sound, when both CPA and TCPA becomes below a setting value (the approach
watch area).
The range of the target which can be registered is taken as a target with a highest luminosity level of 0.1–16 nm.
• Max. 10 ATA targets and max. 100 AIS targets can be plotted on the screen.
• Plot positions shall be identified by an approved symbol marks (p. 3-29, 3-31) and associated plot number.
• The vector origin will move across the screen at a rate and direction defined by the calculated true or relative
course and speed.
• The vector will be displayed on the target.
• Display accuracy may increase by the self-ship and course change of target or acceleration, slowdown, etc.
■ ATA & AIS menu setting
<ATA & AIS function menu>
Set the ATA & AIS menu items before using the ATA
or AIS function.
q Push [MENU], and then rotate [DIAL] until the
"Tool" menu becomes highlighted.
w Push [ENTER], and then rotate [DIAL] until the
"ATA & AIS" menu becomes highlighted.
e Push [ENTER], and then rotate [DIAL] to select the item.
D ATA & AIS Alarm
The ATA and AIS Alarm function can be turned ON
or OFF.
• OFF : The ATA and AIS Alarm function is OFF.
• ON
: The ATA and AIS alarm is emitted when
both CPA and TCPA reaches the limit.
D CPA
Set the CPA limit distance.
• 0.50–12.0 nm (Default: 0.50 nm)
D TCPA
Set the TCPA limit time.
• 0.5, 1, 2, 3, 4, 5, 6 or 12 minutes (Default: 0.5 minutes)
* CPA/TCPA: Closest Point of Approach and Time
to Closest Point of Approach limit is defined by
the observer to a given warning when a target or
targets are close to within those limits from your
own ship.
D Vector Mode
Select the mode.
• True (True vector):
The predicted true motion of a target as the result
of your own ship's direction and speed input.
• Relative (Relative vector):
The predicted movement of a target relative to
your own ship.
D Target Track
Select the interval to update the past position.
• 0.5, 1, 3, or 6 minutes (Default: 1 minute)
3-28
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