ITU-R Recommendation M.1371-1 describes the following types of AIS:

Class A
Shipborne mobile equipment intended for vessels meeting the requirements of IMO AIS carriage requirement.

Class B
Shipborne mobile equipment provides facilities not necessarily in full accord with IMO AIS carriage requirements. The Class B is nearly identical to the Class A, except the Class B:

  • Has a reporting rate less than a Class A (e.g. every 30 sec. when under 14 knots, as opposed to every 10 sec. for Class A)
  • Does not transmit the vessel's IMO number
  • Does not transmit ETA or destination
  • Does not transmit navigational status
  • Is only required to receive, not transmit, text safety messages
  • Is only required to receive, not transmit, application identifiers (binary messages)
  • Does not transmit rate of turn information
  • Does not transmit maximum present static draught
8/26/2013 04:53:40 pm

As an amateur writer, I infrequently come across really well written publications like your blog which really helps me inspirationally. It shows me what excellent publications are all about. There are lots of substandard writings on the web and it's very sad. Thank you for your well written posts! I frequently read your blog and enjoy the content you share. I look forward to more of your work.

Reply



Leave a Reply.