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T300B-S Class B SOTDMA AIS Transponder with Internal Splitter

SKU: COM-0004


The T300B-S is a compact and rugged SOTDMA AIS Transponder with a built-in Antenna Splitter, designed for the demands of small commercial boats, fishing boats, 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-S will transmit its own vessel position and data and receive information from other AIS vessels, shore stations and navigational aids within the VHF range.

The built-in Antenna Splitter allows the unit to share a single VHF antenna with a VHF radiotelephone, eliminating the need for a second VHF antenna on the vessel and reducing installation time and cost. Additionally, the unit has an FM radio output for monitoring public service FM radio broadcasts.

The user initially programs the unit with the supplied software over a USB interface. The T300B-S is compatible with a range of computer-based navigation programs and chart plotters that accept AIS data sentences over an NMEA 0183 or NMEA 2000 connection.


  • SOTDMA Transmission Standard
  • Built-in Antenna Splitter to enable the use of VHF Radio and AIS simultaneously
  • NMEA 0183 and NMEA 2000 are compatible
  • Compact Aluminium Housing
  • Ideal AIS Receiver for Commercial Boats and Leisure Craft
  • Automatic Transmission of Vessel’s own position, speed and heading to other vessels within VHF range
  • A method of monitoring the position, speed and heading of other AIS vessels within the VHF range
  • Ability to plot the progress, changes in heading and speed of other AIS vessels on a PC or Chart Plotter
  • Transmitter OFF facility to conserve power or for covert use


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


T300B – Class B SOTDMA AIS Transponder
AS300 – AIS / VHF Antenna Splitter
AV100 – Stainless Steel Whip Antenna
AV300 – Fibreglass VHF Antenna
AV400 – Commercial Antenna for AIS
AG100 – GPS Antenna

T300B-S Data Sheet