Tianjin 712 Communication & Broadcasting Co., Ltd.
Main products:Marine AIS,Two Way Radio,GPS
Contact Us
  • Contact Person : Ms. Wu Liping
  • Company Name : Tianjin 712 Communication & Broadcasting Co., Ltd.
  • Tel : 086-022-65388698
  • Fax : 086-022-65388646
  • Address : Tianjin,Tianjinshi,Rm. 218-219, Syntheses Service Building, West Area, No. 19, Xinye Sixth Street, West Tianjin Economic and Technological Development Zone
  • Country/Region : China
  • Zip : 300462

Marine Navigation GPS Vessels AIS Class B Transponder

Marine Navigation GPS Vessels AIS Class B Transponder
Product Detailed
1.High Real-time management; 2.Distance alarm, etc. 3.Marine AIS Class B with emergency call button;

 Marine Vessels  AIS CLASS B Transponder

    Vessels equipped with AIS can achieve collision avoiding, information exchange, vessel positioning, distance alarm, etc. It makes up ARPA collision avoiding radar’s disadvantage in monitoring objects in heavy rain, and solves difficulties in location accuracy, identification of vessel type. It also helps a lot in harbor management.

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

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

2,     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


Sailing speed >2 kt


AIS base station



Technique Data:


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


VHF Antenna ConnectorGPS Antenna ConnectorRS232/RS422/Power Supply

GPS Module

In accordance with IEC61108-1 Standard

Operating Temperature


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       70dB  Inter-modulation Rejection 65dB Blocking               84dB

Support receiver silent function

Compatible with following standards

IEC62287 FDISIEC60945 Edn 4.0 ITU-RM.1371-2


AIS Class B  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.


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.

Marine Navigation GPS Vessels AIS Class B Transponder

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