ACR Electronics GlobalWatch 2 AIS Especificações descarregar pdf (Página 11)

Thank you for purchasing the Simrad AIS Class A transponder.

The Simrad MX535B has been developed to offer you the highest level of performance and durability and we

hope that it will provide many years of reliable service. This product has been designed to meet the highest

possible quality standards and should you encounter any problems with this product, please contact your

local dealer for assistance.

2.1 About AIS in general

The Automatic Identification System (AIS) is based on the IMO regulation for AIS using Self Organized Time

Division Multiple Access (SOTDMA) technology based on a VHF Data Link (VDL).

The system operates in the following modes:

O Autonomous (continuous operation in all areas)

o Assigned (data transmission interval remotely controlled by authority in traffic monitoring

service)

o Polled (in response to interrogation from a ship or authority)

o Silent (listening only, use with caution)

The system is synchronized with GPS time (UTC) to avoid conflict among multiple users. If GPS data is

not available, the system is self-synchronized using the VDL message.

The VHF channels 2087 and 2088 are the main AIS channels in addition to local AIS frequencies. AIS

transponders onboard ships exchange various data as specified by IMO and ITU on either frequency

set up by:

O The frequency management telecommand (DSC)

O Special AIS messages sent from an AIS Base station

O Manual input of special region

The normal transmit power is 12.5 W, but under certain conditions, as during tanker loading

(according to ISGOTT regulation), or the use of regional settings, a low power option (1 W) is

automatically selected.

2 Operation General Introduction

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ACR Electronics GlobalWatch 2 AIS Especificações Página 11