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1.2 AIS in an Operational Environment
This illustration depicts a typical AIS System, where two or more AIS equipped
vessels (and shore based systems) are automatically communicating with each
other.
On the bottom, a typical NAUTICAST installation in a common environment is shown. The
NAUTICAST is connected to the vessels emergency power supply, and in connection with
the VHF, and GPS-Antennas, the minimal requirements for Transponder operation are
fulfilled.
Both vessels in the above illustration are equipped with a NAUTICAST (or any other
certified AIS-Transponder). Due to "Time – Synchronization" they use the same
organization of free and allocated windows (Slots) in the shared VHF Data Link (this
method is called "Self Organized Time Division Multiple Access") to send and receive
messages.
Without the necessity of any active interaction, both vessels know exactly who or what is
cruising nearby and where the individual object is heading.
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Installation Manual
Y1-03-0208 Rev.A
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