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Author Topic:   New Class-B AIS from SRT
jimh posted 06-06-2015 04:24 AM ET (US)   Profile for jimh   Send Email to jimh  
The British firm SRT < >are principal OEM manufacturers of many devices for the Automatic Identification System (AIS). They recently announced their development of a new AIS Class-B transponder product intended for the large recreational boat market.

In the AIS Class-B transponder category, there are two type of devices:

--2-Watt transponders using the carrier sense time division multiple access (CS TDMA) technique for interoperation with Class-A devices, and

--5-Watt transponders using the self-organized time division multiple access (SO TDMA) technique, the same method used in Class-A devices.

The newly announced SRT product will be a 5-Watt SO TDMA Class-B transponder. It will also feature a high resolution color display with the ability to show digital charts in the ENC format. The transponder will also incorporate SRT's proprietary Advanced Class-B Satellite Enabled AIS (ABSEA) technology which, in conjunction with exactEarth's private AIS data collection service using satellites, should improve the visibility of the transponder to satellite detectors.

SRT has indicated the new 5-Watt SO TDMA Class-B transponder will be available later in 2015. SRT generally does not sell their devices directly to end users. SRT products are usually sold under license with other branding by other companies. One exception to that general rule is found with em-trak, the house brand for SRT products. See .

No price range has been mentioned for the new product.

For more about ABSEA, refer to

For more about exactEarth, refer to


jimh posted 06-29-2015 08:56 AM ET (US)     Profile for jimh  Send Email to jimh     
Below is a link to a very nice table (created by the Coast Guard of the USA) that presents a great deal of information about the capabilities of three classes of AIS transponders:

Class A, Class B--Self-organizing, and Class B--carrier sense:

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