Nauticast B AIS-300

The reliable and sturdy AIS Class B Transponder and predecessor of our current Nauticast B2







Product discontinued


The B300 was sold worldwide as a consumer market class B device and is still in operation many, many times. Until today it fulfills all relevant class B specifications and norms. 

We offer the following service and repair options:

  • MMSI reset: If you purchase a boat with our B AIS-300 installed or buy a used device, you may need to set a new MMSI number. Regulations in most countries require that this be done by the manufacturer or an authorized dealer. We offer this MMSI reset remotely via the Internet. All you need is the AIS-300 connected to a PC with internet access and Link2AIS installed. For the connection you need the original data cable and most likely a serial to USB converter. Alternatively, you can contact a local partner company in your region. Please refer to our partner network listings.
  • Repair / Updates: If you experience problems or require assistance please contact us at support@nauticast.com or use our contact form


Technical Specifications 

Model Nauticast B AIS-300 


7.8 x 6.22 x 1.84 in. (198 x 158 x 46.7 mm)


13.2 oz (375g) 


9.6-15.6 VDC
Average power consumption 4W 
Peak current rating 2A 


RS232 38.4kBaud bi-directional
RS422 NMEA 38.4kBaud bi-directional


IEC 60945
IEC 62287, Section 5, Cat c) exposed to the weather
-25ºC to +55ºC 


Transmitter x 1
Receiver x 2 (One receiver time shared between AIS and DSC)
Frequency: 156.025 to 162.025 MHz in 25 kHz steps  


GPS Receiver (AIS Internal)  IEC 61108-1 compliant


Power, TX timeout, status, pre-set SRM sent

Operator Controls:

Optional pre-set safety related message (SRM) transmit button