Weatherdock Academy AIS Basics What Why How Who

Weatherdock Academy AIS Basics What | Why | How | Who

What is AIS? Weatherdock AG Distributor Academy The Automatic Identification System (AIS) is a maritime transponder/receiver system defined by the IMO (International Maritime Organisation). • By using AIS vessels identity themselves and declare clearly their current position, curse and speed over ground as well much more data to all other vessels in the vicinity. • AIS operates worldwide standardized in the VHF maritime frequency band on • 161, 975 MHz (often named as chanel A = chanel 87) and • 162, 025 MHz (often named as chanel B = chanel 88) 02. 03. 2021 – Page 2 CONFIDENTIAL – all rights reserved ©Weatherdock AG - AIS Basics AIS is the short cut for „Automatic Identification System“

Why AIS? Weatherdock AG Distributor Academy • To improve maritime safety • To protect the maritime environment 02. 03. 2021 – Page 3 CONFIDENTIAL – all rights reserved ©Weatherdock AG - AIS Basics AIS main objectives:

AIS… AIS Basics … assits collision avoidance (AIS ship-to-ship + AIS ship-to-shore) … is used for the automatic exchange of information between vessels among themselves and with land stations … enables ports and coastal states to identify ships and to manage and supervise the traffic in their waters (AIS coast station, VTS) … helps to resolve the difficulty of identifieng ships when not in sight (e. g. at night, in radar blind arcs or shadows or at distance) … protects the environment by potentially increasing navigation safety and avoiding collisions Weatherdock AG Distributor Academy 02. 03. 2021 – Page 4 CONFIDENTIAL – all rights reserved ©Weatherdock AG - Why AIS?

AIS Basics AIS… Weatherdock AG Distributor Academy … automatically exchanges data from special FM transmitters and receivers in short terms, e. g. driving data … is a worldwide standardized process independent of the manufactuerer and runs everywhere … data is exchanged using a total of 27 types of telegrams … enables to view over obstacles and complements radar. Acording to the antenna instalation hight an AIS station has got a transmission range about 20 to 30 nautical miles. 02. 03. 2021 – Page 5 CONFIDENTIAL – all rights reserved ©Weatherdock AG - Why AIS?

Why AIS? Weatherdock AG Distributor Academy - 02. 03. 2021 – Page 6 Due to a difficult terrain the two ships do not have RADAR contact AIS + by AIS the two ships can see each other CONFIDENTIAL – all rights reserved ©Weatherdock AG - AIS Basics RADAR

Who needs AIS? Weatherdock AG Distributor Academy Commercial shipping Class A (EN 61993 -2: 2002) 02. 03. 2021 – Page 7 Pleasure boating Class B (IEC 62287 -1: 2017) CONFIDENTIAL – all rights reserved ©Weatherdock AG - AIS Basics AIS Classes

AIS Basics In order to ensure that the VHF transmissions of different AIS transponders do not occur at the same time, there are two different procedures implemented for Class A and Class B service. AIS Chanel-Management Class A Transmission process: Class B Transmission process: SOTDMA oder CSTDMA SOTDMA = „Self-Organized Time Division Multiple Access“ CSTDMA = „Carrier Sense Time Division Multiple Access“ Weatherdock AG Distributor Academy 02. 03. 2021 – Page 8 CONFIDENTIAL – all rights reserved ©Weatherdock AG - How does AIS work?