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Automatic identification system

Automatic identification system (AIS) is designed for:

  • sharing navigational data between vessels and shore stations to prevent collisions;
  • transmitting information related to the vessel and its cargo to shore authorities;
  • transmitting navigational data from the vessel to shore vessel traffic control systems (VTCS)

AIS transceiver operates in the maritime mobile service VHF band and provides the communication range within direct radio line of sight (about 30 nautical miles). AIS shipboard equipment can be equipped with a display to show AIS data and vessel positions.
Application satellites and advanced processing technologies allows satellite detection of AIS signals.
Satellite AIS equipment can be used for solving objectives of world-wide monitoring of vessels in the Global ocean.

AIS Classification

Currently, international standards make provisions for the application of two types of AIS shipboard equipment:

Class A

Equipment related to Class A must meet performance specifications established by the International Maritime Organization, in particular, must comprise a minimal display with data manual entry option. The vessels with class A equipment can be tracked by satellite systems of AIS signal monitoring with a reasonable validity degree.

Class B

Class B is a simplified version of AIS equipment, which is mainly applied on vessels not falling under the requirements of the International Convention for the Safety of Life at Sea. Detecting AIS class B signals requires application of special signal processing technology, which can be executed both on the satellite board and in the monitoring center.

Option of AIS signal processing

AIS of Class A


AIS of Class B


AIS of Class B, VEGA type

Vessel - Satellite






Vessel - Shore












AIS equipment of class B, VEGA type, produced by Research and Production Enterprise “Muromsky Radiopribor” (Russia), is designed for application on marine vessels as supplementary navigational equipment, and can also be used as a means for monitoring vessels and other floating facilities, including as a technical means of fishing vessels control in different regions of the Global ocean.

Capabilities of AIS related to Class B, VEGA type 

  • Operation in the "vessel-vessel" mode to prevent collisions and improve the navigation safety level.

  • Operation in the "vessel-shore" mode to control the vessel traffic, to transmit the information related to the vessel and its cargo to shore authorities.

  • Ensuring particular operating procedure (exactTrax™) for reliable receipt of class B AIS signals by the service provider of AIS signal satellite monitoring.

ExactTrax ™ technology

The company's technology ExactEarth enables to collect and promptly transmit the required information related to the maritime transport movement, ensuring safety of vessels and navigation.

Among the class B AIS represented in Russia only AIS VEGA VG-3944BB/T implements the new technology exactTrax™, which enables to minimize omissions in the positions transmitted by the operator of vessel AIS signal satellite monitoring.

AIS VEGA VG-3944T/BB equipment

A distinguishing feature of VEGA VG-3944T/BB models is capability to transmit information related to the vessel location obtained from low-orbit space satellite systems to the vessel monitoring center in the automatic mode. 

VEGA VG-3944 equipment can be supplied in two hardware versions: 

  • with display (VG-3944T/ VG-3944T-8/ VG-3944T-12) 

  • without display (VG-3944BB)


    VEGA VG-3944BB

"Black-box" set (without display), minimum-mandatory



AIS-B "black-box", power 9-36V


GPS+GLONASS aerial, cable 10 m


VHF aerial 1.2 m, cable 10 m


AIS transponder (receiver/transmitter) of class B in "BlackBox" version ensures exchange and issue of the following AIS information:

Dynamic data

  • vessel coordinates (built-in GLONASS/GPS receiver)
  • time (UTC)
  • course over ground (COG)
  • speed over ground (SOG)
  • heading (HDG)
  • vessel status
  • circumferential velocity/turning rate

Static data

  • MMSI number (Maritime mobile service identifier)
  • vessel call sign and name
  • vessel dimensions (length and width)
  • IMO number (if any)
  • vessel type
  • location of GNSS aerial on the vessel board

Travel data

  • vessel draught
  • type of cargo
  • data transfer rate: 9600 bits per second (GMSK),1200 bits per second (FSK)
  • transmitter power: 2 / 5 W
  • format of i/o data NMEA-0183, i/o ports RS232 and/or RS422



AIS transponder of class B (power 2 / 5W)


Set with a 5.6-inch display and chart plotter function


VEGA VG-3944T-5,6”

5.6-inch AIS-B display, SD card slot, GPS+GLONASS aerial, 9-36V




VHF aerial 1.2 m, cable 10 m

Various display modes

  • plotter
  • navigation information
  • satellite information
  • AIS information
  •  compass

Tracking to the destination point
Course navigation
Map orientation selection
Alarm signal at deviation from waypoints

Screen palette:

  • standard
  • day – in sunlight
  • night – in insufficient light NOAA – paper map colors
  • Velocity and wind direction screen when optional detector is connected
  • Format of i/o data NMEA-0183, i/o ports RS232 and/or RS422 Power supply: 10.5 – 35 VDC, consumption current <500 mA at 12VDC

AIS transponder models with a larger display diagonal: VG-3944T-8 – display 8”, VG-3944T-12 - display 12”

Set with a 8 inch and a chart plotter function

VEGA VG-3944Т-8,0”

8-inch AIS-B display, chart plotter, GPS+GLONASS aerial, 9-36V


VHF aerial 1.2 m, cable 10 m




Set with a 12,1 inch and a chart plotter function




12-inch VG-AIS-B display, chart plotter,

GPS+GLONASS aerial, 9-36V


VHF aerial 1.2 m, cable 10 m



Alarm reporting  button (optional)


Isolated power supply  9-36V (option)


Should you have any questions please do not hesitate to contact Morsviazsputnik Monitoring or Comercial Deparment via e-mail: / .