Kongsberg Seatex AIS 100, Instruction Manual

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Seatex AIS 100 Instruction Manual, rev. 5 Operation
9
2 OPERATION
2.1 Introduction
The AIS should always be in operation. It is recommended not to
switch off the AIS during port stays in order to provide information to
port authorities. In areas where piracy occurs, the master may switch
of the transmitter. If the transmitter is switched off, static data and
voyage related information will be stored.
2.2 Operational modes
After the unit has been installed and configured it operates
automatically without any user intervention. The mobile station has
three operational modes:
•
Autonomous and Continuous mode
•
Assigned mode
•
Polled or Controlled mode
2.2.1 Autonomous and continuous mode
In the Autonomous and Continuous mode the mobile station
automatically defines its own reporting rate in accordance with its
navigational mode, speed and course. The unit also selects its own
data transmission slots. This is the normal mode for operation in all
areas but the mode may be switched to/from Assigned mode or Polled
or Controlled mode by a competent authority via a base station on
shore.
2.2.2 Assigned mode
A competent authority responsible for traffic monitoring may
remotely set transmission intervals and/or time slots for the vessel
mobile station. When operating in Assigned mode, the mobile station
will transmit position data on a slightly different format, AIS Message
Type 2, instead of the transmitted AIS Message Type 1. In Assigned
mode the mobile station does not change its reporting rate when
changing course and speed. Assignments are limited in time and will
be re-issued by the competent authority when needed. Thus, Assigned
mode only affects the transmission and not the reception of position
reports.