JRC JMA-9923-9XA - Page 349

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1-9. Definitions of AIS Tarqet Svmbols
TheAlS
symbol
is
as follows.
Symbol
AIS Target Definitions &
Meaning
4
Sleeping
Target
A
target symbol
indicating ihe
presence
and orientation
of a vessel
equipped
with AIS in a certain
location. No additional information
is
presented
until activated
thus avoiding
information
overload.
The most acute apex
of the triangle
is aligned with
the heading
of the target,
or with its COG.
Activated
Target
A
symbol representing the automatic
or manual
activation of
a sleeping
target for
the display
of additional
graphically presented
information
including:
-
a vector
(speed
and course
over
ground
or
water);
-
the
heading; and
-
ROT
or direction
of tum indication
(if
available) to display actually
initiated course
changes.
The
COG/SOG vector
is displayed as dashed
line.
The
heading is displayed as
solid
line
of
fixed length.
A
flag
on the
heading
indicates a turned its
direction
in
order
to detect a
target
maneuver.
When
no data is
coming, the vector,
heading
and flag are not
displayed.
r-
-t
L-J
Selected
Target
A symbol
representing the
manual or automatic selection of any
AIS target
for the display of
detailed information
in a separate data display
area. In
lhis
area,
received target
data as well
as the calculated CPA and TCPA
values
will
be shown.
Squares
indicated
by its
corners
are drawn around the target symbol.
This
mark
is
displayed
on the around
of a
numerical
display target.
Dangerous
Target
A symbol representing
an AIS target
(activated
or not)
which
data
contravene ore-set
CPA and
TCPA limits.
CPA/TCPA
alarm
sound occurs and
a
symbol
is flashed until
acknowledged.
€
Lost
Target
A
symbol representing the
last valid
predicted position
of
an
AIS
target
before
the reception
of its data was
lost.
It
will
become a
lost
target
when
fixed
time reception of the
data of a
dangerous
target
cannot be carried
out. When it becomes a lost
target, a
symbol
will be displayed
on the
position
predicted
by data received at
the
end,
such as a course
and speed.
A-37