Maritime Security
AIS:When & Where? Here & Now!
Leica's Guide
To AIS
AIS is a ship-
board broadcast
transponder system
in which ships con-
tinually transmit
their ID, position,
course, speed and other data to all
other nearby ships and shoreside
authorities on a common VHF radio
channel. AIS is designed to operate
in one of the following modes: In a
ship-to-ship mode for collision
avoidance, as a means for coastal
states to obtain information about a
ship and its cargo and as a traffic
management tool when integrated
with a Vessel Traffic System (VTS).
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avoidance
• As a means for coastal states to
obtain information about a ship and its
cargo
• As a traffic management tool when
integrated with a Vessel Traffic System
(VTS)
The primary operating mode for AIS
will be autonomous ship-to-ship report-
ing. In this mode, each ship transmits its
data to all other AlS-equipped ships
within VHF range. The unique commu-
nications scheme permits these data
transmissions to take place independent-
ly without the need for a master control
station.
Position and other data are fed auto-
matically from the ship's sensors into the
AIS system, where the data is formatted
and transmitted in a short data burst on a
dedicated VHF channel. When received
on the other ships, the data is decoded
and displayed for the officer of the
watch, who can view AIS reports from
all other AlS-equipped ships within
range in graphic and text format. The
AIS data may optionally be fed to the
ship's integrated navigation systems and
radar plotting systems to provide AIS
"tags" for radar targets. The AIS data
can also be logged to the ship's Voyage
Data Recorder (VDR) for playback and
future analysis.
In coastal waters, shoreside authorities
may establish automated AIS stations to
monitor the movement of vessels
through the area. These stations may
simply monitor AIS transmissions from
passing ships, or may actively poll ves-
sels via the AIS channels, requesting
data such as identification, destination,
ETA, type of cargo and other informa-
tion. Coast stations can also use the
Maritime Reporter & Engineering News
$•--•"-BSitil
The events of September 11. 2001 will
continue to have lingering effects on the
world indefinitely. The most visible
remnant in the maritime world is the
drastically heightened sense of safety
and security, as officials in countries
around the globe seek to secure their
borders from the threat of attack —
either direct or covert — via ship.
Many of the issues currently on the
legislative fast track were already in the
works pre-September 11. False crew
documentation, enhanced vessel track-
ing and beefed-up harbor controls were
much-discussed topic in previous years.
As is the case more often than not.
electronic solutions, recently unveiled enhanhced visualization technology.
though, a disaster of some proportion is
inevitably the impetus in moving from
discussion to action.
Such is the case with the Automatic
Identification System (AIS). which has
quickly become a top agenda item in the
fight to ensure maximum maritime secu-
rity.
The matter of fast-track implementa-
tion for AIS has been taken up by by the
U.S. Coast Guard through the Interna-
tional Maritime Organization, with
urgent suggestions to implement manda-
tory AIS on vessels of 500 gt and above
on international voyages as soon as pos-
sible, with the final implementation to
be decided at a meeting in December
2002.
What is an AIS?
As described in a booklet entitled "A
Complete Guide to Automatic Identifi-
cation Systems" by Leica Geosystems, a
pioneer in AIS technology, AIS is a ship-
board broadcast transponder system in
which ships continually transmit their
ID. position, course, speed and other
data to all other nearby ships and shore-
side authorities on a common VHF radio
channel. AIS is designed to operate in
one of the following modes:
In a ship-to-ship mode for collision
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