14-1
14. AIS, DSC MESSAGE
14.1 What is AIS?
AIS (Automatic Identification System) is a system that continuously transmits the iden-
tification and position of your ship to AIS-equipped ships within VHF range. All such
ships also receive data from other AIS-equipped ships and display their positions and
other relevant information. The AIS broadcasts this information over a VHF transceiv-
er. The information is as shown below.
14.2 How to Show or Hide the AIS Symbols
1. On the radar display or chart plotter display, open the Layers menu.
2. Turn [AIS Targets] on or off.
14.3 AIS Target Symbols
• Position • Call sign
• Name of ship • Speed over ground
• Course over ground • Rate of turn
• Heading
Target
type
Symbol Description
Activated
AIS target
COG is indicated on the symbol with
a dotted line.
Note: An AIS symbol that has a "TX
marker" (callout) above it indicates
that vessel has transmitted an AIS
message.
Dangerous
AIS target
The target whose CPA and TCPA are
smaller than the CPA/TCPA (see
section 14.11). alarm setting is indi-
cated as a dangerous target.
SOG/COG
vector
ROT (Rate of Turn)
Heading
line
Symbol color
Blue: Class A AIS target
Green: Class B AIS target
Blue (hollow): BFT AIS target (see next page)
TX marker
(callout)
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