Assessments - 3, GPA: 3.7
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Lesch 2009-09-27 1.0.8 G Released Software dependencies B.Werner 2010-05-11 1.0.8 H Released Blue Sign Cable clarifications B. Werner Software dependencies This revision of the Manual is valid for the Software version (s) below stated and future versions unless otherwise noted (ref.: / ). Date AIS software Version Status Comments Responsible 2009-07-21 2.0.S116.X714 Released New GPS Module. New way to store ship dimensions A. Lesch 1 General Introduction 1.1 Description of AIS What does the abbreviation AIS stand for? AIS stands for: “Automatic Identification System” What is AIS? According to IALA regulations, AIS is defined as follows: Very simply, the AIS is a broadcast Transponder system, operating in the VHF maritime mobile Band. It is capable of sending ship information such as identification, position course, speed and more, to other ships and to shore. It can handle multiple reports at rapid update rates and uses Self-Organizing Time Division Multiple Access (SOTDMA) technology to meet these high broadcast rates and ensure reliable and robust ship to ship operation. What are the performance standards of AIS? The IMO defines the performance standards as follows: - Ship to Ship working - Ship to Shore working, including Long Range Application - Automatic and continuous operation - Provision of information messaging - Utilization of maritime VHF channels Which modules make up an AIS-Transponder? The Modules: - DGPS / GPS receiver - VHF Radio - Antenna - Computer (CPU) - Power Supply Appropriate application software connects the individual modules. In which modes does AIS function? AIS are required to function flawlessly in a variety of modes. The relevant regulations require: The system shall be capable of - An "autonomous and continuous" mode for operation in all areas. This mode shall be capable of being switched to/from one of the following alternate modes by a competent authority; - An "assigned" mode for operation in an area subject to a competent authority responsible for traffic monitoring such that the data transmission interval and/or time slots may be set remotely by that authority; - A "polling or controlled" mode, where the data transfer occurs in response to interrogation from a ship or competent authority. 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. 1.3 AIS Networks The scenario below shows a full AIS coverage area (including all applications and complete shore infrastructure). The Carriage Requirement currently applies to SOLAS Vessels and will be extended on Inland Waterways. 2 NAUTICAST 2.1 System Overview Unlike other AIS devices, the NAUTICAST™ combines all required functions into one cabinet. Additionally, the NAUTICAST™ gives the operator a number of additional features (easy mounting & installation, environmental protection and smallest dimensions). 3 Installation IMPORTANT: AUTHORITIES MANDATE that after the physical installation has been successfully completed, all ships data and settings be entered into the AIS transponder. See Section 4 for further instructions. 3.1 Installation Requirements General Requirements Please note that international conventions, regulations, instructions and guidelines have to be adhered to when installing the NAUTICAST™. The following points must be observed before installation can commence: - Permission by the local authority to install such a device must be granted. - Trained service personnel must undertake the installation. - The NAUTICAST™ must be fitted in a suitable place on the bridge. - The VHF and GPS Antennas must be installed in a suitable position, where excellent reception conditions apply (refer to Chapter 3.10 Installation of VHF antenna) - All available interfaces must be installed. - The vessels power supply must suffice, and the GMDSS power supply has to be used. - Installation of the pilot plug in conning position (close to the pilot working place). 3.2 Installation Overview Survey AIS is considered part of the ship.s radio station and is surveyed together with radio installation. Surveys on S...