Ais In An Operational Environment - ACR Electronics Nauticast Y1-03-0212 Installation Manual

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.
Installation Manual 2 Y1-03-0212 Rev. E