4. AIS OPERATION
4-3
4.2 AIS Symbols and Their Meanings
When the AIS is active, AIS targets are marked with the appropriate AIS symbol, as
shown in the table below.
Note 1: The equipment continues to process AIS targets when the AIS feature is de-
activated. When the AIS is activated again, symbols are immediately displayed.
Note 2: AIS symbols are momentarily erased and the screen is redrawn after the
heading is changed in the HEAD UP mode.
Note 3: When no AIS data is received, the message "AIS COM ERROR" appears in
the Alert Box. Check the AIS transponder.
Note 4: Physical and virtual AIS AtoN symbols that may appear are listed on the fol-
lowing page.
Target with
neither a
reported
heading nor a
COG
Target selected
for data display
Scaled symbol
Sleeping target
Lost target
Dangerous
target
ROT higher
than preset
ROT
Activated
target
Symbol shape is based on antenna location, ship length and ship
width. Size changes depending on range from own ship.
Indicates the presence of a target equipped with AIS.
Color is selectable from menu.
Broken square is overlaid on target selected to display its data.
A, B or C shown to indicate data box location at right side of the
screen.
“X” overlaid on a lost target.
Red in color. Erased after acknowledged.
Displayed for turning ship.
All AIS symbols shown with thick line.
Color is selectable from menu.
Displayed when CPA/TCPA is within CPA/TCPA limit.
Red in color. Flashing until acknowledged.
A
A target with neither a reported heading nor COG is oriented
toward the top of the operational display area. The symbol is
shown with a solid line.
SYMBOL STATUS REMARKS
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