Arcan ® 02-Май-2020 13:32

Furuno Class A AIS FA-170 Operators Manual


Year: 2019
Language: english
Author: Furuno
Genre: Manual
Publisher: Furuno
Edition: E1
Format: PDF
Quality: eBook
Pages count: 100
Description: The Automatic Identification System (AIS) was originally developed to aid the Vessel Traffic Services (VTS) by use of a VHF transponder working on Digital Selective Call (DSC) at VHF CH70,
and is still in use along the UK coastal areas and others. Some time later the IMO developed a
Universal AIS using the new sophisticated technology called Self-Organized Time Division Multiple Access (SOTDMA) based on a VHF Data Link (VDL).
The system operates in three modes – autonomous (continuous operation in all areas), assigned
(data transmission interval remotely controlled by authority in traffic monitoring service) and polled
(in response to interrogation from a ship or authority). It is synchronized with GPS time to avoid
conflict among multiple users (IMO minimum 2000 reports per minute and IEC requires 4500 reports on two channels). The VHF channels 87B and 88B are commonly used and in addition there
are local AIS frequencies. Shipborne AIS transponders exchange various data as specified by the
IMO and ITU on either frequency automatically set up by the frequency management telecommand received by the DSC receiver on ship.
As an anti-collision aid, the AIS has the following advantages over radar:
• Information provided in near real-time
• Capable of instant presentation of target course alterations
• Not subject to target swap
• Not subject to target loss in clutter
• Not subject to target loss due to abrupt maneuvers
• Able to “detect” ships within VHF/FM coverage, including in some circumstances, around bends
and behind islands.
When using the AIS for anti-collision purposes it is important to remember that the AIS is an additional source of navigation information. It does not replace other navigational systems. The AIS
may not be giving a complete or correct “picture” of shipping traffic in its vicinity.
The use of the AIS does not negate the responsibility of the OOW to comply with all collision regulation requirements, especially the maintaining of a proper look-out. The prudent navigator uses
all aids available to navigate the ship.

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