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Operation
Page 19
3.10 Target plot screen
The target plot screen shows the location of other AIS equipped vessels and shore stations relative to your own
vessel. The target plot screen provides a basic overview of AIS targets and should not be regarded as a
substitute for display of AIS information on a dedicated electronic chart display system (ECDIS).
Figure 12 Target plot screen
The plot range can be adjusted by pressing the ‘
Range
’ function key which cycles through the ranges 48, 24,
12, 6, 3, 1 and 0.5nm. The range relates to radius of the outer range ring shown on the screen.
Individual targets can be selected using the scroll wheel. When selected a square outline will appear around
the target, pressing the scroll wheel will display full vessel details. To return to the target plot screen from the
vessel details screen press the back key.
Different symbols are displayed for an AIS target depending on the type of target and its status, these are
shown in Figure 13. The own vessel symbol is always shown at the centre of the plot.
Figure 13 Target plot symbols
3.11 Working with AIS text and Safety Related Messages (SRMs)
AIS text messages and Safety Related Messages (SRMs) can be received from other AIS equipped vessels
and also sent to specific vessels (addressed messages) or sent to all vessels in range (broadcast messages).
3.11.1 Receiving AIS text and Safety Related Messages
Reception of an AIS text message is indicated by the presence of the message icon in the status bar. This icon
is shown whenever there are unread AIS text messages. Messages can be reviewed and replied to via the
messages screen; see section 3.8.
When a Safety Related Message is received the user will be notified immediately with a screen showing the
message. Standard text messages are not displayed on receipt, however the message icon will be displayed
on the status bar.
R ange
Screen
Na
m
e of selected target
MMSI of selected target
Heading line (points up to signify heading up)
Selected target
[HDG UP]
27 Tgts
10nm
MARY ROSE
235687901
Nu
m
ber of targets on display
Range selection key
heading up
m
ode
Range selected
Lost target (vessel)
Target (vessel)
Own vessel
AtoN
Base station
SART
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