■
ATA (Automatic Tracking Aid)
By automatically tracking the target chosen by the cursor key, the closest point of approach (CPA) and the time to
closest point of approach (TCPA) limit of your ship and a target are calculated.
ATA is the function to tell about to alarm sound, when both CPA and TCPA becomes below a setting value (the ap-
proach watch area).
The range of the target which can be registered is taken as a target with a highest luminosity level of 0.2–16
miles.
• A maximum of 10 targets can be plotted on the screen.
• Plot positions shall be identified by an approved symbol mark (p. 19) 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 menu setting
Set the ATA menu items before using the ATA func-
tion.
A T A MENU
VECT
No.DISP
OFF
ALL
OWN VECT
ALARM
CPA LIMIT
TCPA LIMIT
TRUE
ON
ON
ON
OFF
REL
OFF
OFF
1.0NM
1 MIN
A T A
SEL
q
Push [MENU]/[
] one or more times to turn ON
the ATA menu.
w
Push [
u
] to turn ON the ATA function.
e
Push [
q
] to select the “No. DISP” to select the tar
-
get identification number type which appears at the
right side of the mark. Push [
t
] [
u
] to select the
appropriate type.
• OFF: No number appears.
• SEL: Number appears by the selected mark only.
• ALL: All numbers appear by the marks.
r
Push [
q
] to select “VECT”; push [
t
] [
u
] to select
the vector type.
• TRUE (True vector):
The predicted true motion of a target as the result of your
own ship’s direction and speed input.
• REL (Relative vector):
The predicted movement of a target relative to your own
ship.
t
Push [
q
] to select “OWN VECT”; push [
t
] [
u
] to
turn the OWN VECT function ON or OFF.
• OFF: To not display your own ship’s vector.
• ON: To display your own ship’s vector.
y
Push [
q
] to select “ALARM”; push [
t
] [
u
] to turn
the alarm function ON or OFF.
u
Push [
q
] to select the “CPA* LIMIT”; push [
t
] [
u
]
to set the CPA limit distance.
i
Push [
q
] to select the “TCPA* LIMIT”. Push [
t
] [
u
]
to set the TCPA limit time.
• An ATA alarm sounds when both CPA and TCPA
reaches the limit.
* CPA/TCPA: Closest Point of Approach and Time to
Closest Point of Approach limit is defined by the ob-
server to a given warning when a target or targets are
close to within those limits from your own ship.
o
Push [MENU]/[
] to exit the ATA menu.
ATA (Automatic Tracking Aid)
6
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