Information exchange Marine AIS Class B transponder M4501

1.Emergency Call button 2.AIS transponder 3.Collision avoiding 4.Information exchange 5.Vessel positioning, distance alarm;

    

Advantages: 

Safe

Actively sending vessel's dynamic information lets around vessels equipped with AIS know its existence and direction in order to avoid collision accidents.

SOS message can be sent though pressing emergency call button when accidental situation occurs.

Real time

Real-time sending vessel's information at defined time. Sending frequency varies from status.

AIS Class-B Speed Report:

Different type of information has different time interval, which requires different update speed.

Static information: Update once every 6 minutes or when data is revised.

Dynamic information: It depends on changing situation of sailing speed and sailing direction. Detailed data refers to following table.

Sailing Status	Update frequency
Sailing speed <2 kt	3minutes/time
Sailing speed >2 kt	30seconds/time
AIS base station	10seconds

Technique Data:

Appearance	Dimension: 195 mm×170 mm×50mm (L×W×H)  Weight: 1000g
Electrical Interface	RS232 38.4K Baud bi-directional RS422 NEMA, 38.4K Baud bi-directional
Power Supply	12V DC   24V DC Average Power Consumption  Alarming: 12W Standby : 4W
Connector	VHF Antenna ConnectorGPS Antenna ConnectorRS232/RS422/Power Supply
GPS Module	In accordance with IEC61108-1 Standard
Operating Temperature	–25°C~+55°C
VHF Transceiver	Transmitter: 1Receiver: 2 (One receiver time shared between AIS and DSC) Frequency: 156.025-162.025MHz in 25KHz StepOutput power: 37dBm±1.5 dBmChannel Bandwidth: 25KHzChannel Step: 25KHzModulation Modes: 25KHz GMSK (AIS RX and TX) 25KHz AFSK (DSC RX ) Bit Rate: 9600 b/s±50ppm (GMSK) 1200 b/s±30ppm (FSK) Receiving Sensitivity:Sensitivity —107dBm Error Rate 20% Co-Channel  10dB Adjacent Channel 70dBInter-modulation Rejection 65dBBlocking  84dB Support receiver silent function
Compatible with following standards	IEC62287 FDISIEC60945 Edn 4.0 ITU-RM.1371-2

AIS transponder Successful Case

1.BACKGROUND

China Zhoushan fishery belongs to North Pacific fishery, which is one of the world's four major fisheries. It is same famous as Hokkaido fishery,Newfoundland fishery and Peru fishery. Zhoushan fishery is the biggest in-shore fisheries in China. There are 10,000 fishing boats and more than 150,000 fishers during flood peak.

During fishing process collision accidents between fishing boats and merchant ships are very easy to occur because of worse environment and lack of collision avoiding equipments on fishing boats. This kind of accident takes 98% of all fishing accidents. Statistics shows that from 2002 to 2007 there were 115 collision accidents happening between Zhoushan fishing boat and merchant ship, which caused wreck of 42 fishing boats, death of 148 fisher and a direct economic loss of more than RMB20,000,000.

Diagram of Collision Accident Trend from 2002 to 2007

2.SUCCESSFUL CASE

During January to October, 2008, more than 5000 sets AIS products made by Tianjin 712 Communication & Broadcasting Co. Ltd. have installed on fishing boats in Zhoushan, which has successfully prevented occurrence of collision accidents.

Case1

At 9:50 p.m. on April 5th, 2008, a foggy day, when Zhejiang fishing boat 42115 anchoring at 122 degrees 36 minutes east longitude, 29 degrees 38 minutes north latitude, terminal in AIS Class-B marine automatic identification system used on fishing boat sent out distance alarm as a merchant ship was coming close. The alarm informed the ship crew, most of whom were having rest , to evacuate in time. All 12 crew members were saved by nearby fishing boats. Above fact shows that application of this system can effectively prevent occurrence of major accidents.

Case 2

At 11:40 p.m. on February 27, 2008, Zhejiang fishing boat 42265 was wrecked by an unknown merchant ship at 122 degrees 52 minutes east longitude, 28 degrees 09 minutes north latitude and 9 crew members on board were all missing. Wrecker ship escaped. Then through AIS Class-B terminal SOS message with accurate accident location was sent out to nearby boats. After receiving report of the accident, Ocean and Fishery Bureau in Zhoushan immediately take rescue actions and tracked suspicious ships according to vessel’s trace in system’s platform. The wrecker merchant was caught due to AIS Class-B terminal’s cooperation with Ocean and Fishery Bureau’s in-time dispatching of fishing boats, coordination of the maritime police boats and sea plane’s monitoring.

Information exchange Marine AIS Class B transponder M4501