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Comar Systems

Available on backorder


The T300B is a compact and rugged SOTDMA AIS Transponder
designed for the demands of the commercial boat, fishing boat and
leisure markets. It meets the Class B (SOTDMA) standard, allowing
vessels that are not required to fit Class A units to voluntarily fit an AIS Transponder.
When connected to an external VHF antenna and a GPS antenna (not
supplied), the T300B will transmit its own vessel position and data and
also receive information from other AIS vessels, shore stations and
navigational aids within VHF range.
The unit is initially programmed by the user with the supplied
software over a USB interface. The T300B is compatible with a range
of computer based navigation programs and chart plotters, that
can accept AIS data sentences over a NMEA 0183 or NMEA 2000 connection.

• Commercial boat, fishing boat and leisure markets.
• Meets the Class ‘B’ SOTDMA international standard.

• SOTDMA Transmission Standard
• NMEA 0183 and NMEA 2000 compatible
• Compact Aluminium Housing
• Ideal AIS receiver for Commercial boats and Leisure Craft
• Automatic transmission of vessels own position, speed and heading to other vessels within VHF range
• The ability to plot the progress, changes in heading and speed of other AIS vessels on a PC or Chart Plotter
• A method of monitoring the position, speed and heading of other AIS vessels within VHF range
• Transmitter OFF facility to conserve power, or for covert use


Weight: 600 g
Dimensions: L 135 x W 126 x H 50 mm (excl. connectors & bracket)
Mounting: To flat surface with supplied Trunnion Mount
Power: 2-core captive cable, 1 m
Antenna: SO239 UHF Connector
GPS Antenna: TNC Connector
Data In/Out: 9-pin D-sub Connector
NMEA 2000: 5-pin; 2x Data; 2x 12 V dc
Power; 1x Shield USB: USB 2.0 Type B Connector.
Construction: Extruded Aluminium Alloy, ABS
Finish: Black Fine-texture Powder-coat, ABS

VHF Transceiver: Transmitter x1; Receiver x2
Transmission Power: 5 W (SOTDMA)
VHF Antenna Impedance: 50 Ω
Frequency Range: 156.025 – 162.025 MHz in 25 kHz steps
Channel Bandwidth: 25 kHz
Channel Steps: 25 kHz
Display: Discrete Indicator LEDs
Data Received: • Class ‘A’ and Class ‘B’ AIS Transmissions• Safety messages • Aids to Navigation
Data Transmitted: Name of Vessel • MMSI • Position• Speed (SOG) • Course (COG) • Type of Vessel
• Call Sign • Heading • Vessel Dimensions.
GPS Antenna Impedance: 50 Ω
Indicators: On, TX, RX, Status, TX Timeout, Error, TX Off

Power Supply: 12 V dc (9.6 – 15.6 V dc); 250 mA; 3 W nominal
Peak Current Rating: 2.5 A
Data Output: NMEA 0183: 38,400 and 4,800 Baud

IP Rating: IP40
Operating temp: -15°C to +55°C
Compass: Safe Distance 50 cm

Supplied: T300B Transponder; trunnion bracket; power, data and programming cables
Required: GPS Receive Antenna AG100 for AIS re-transmission of Vessel Position
Required: AIS VHF Antenna


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