Automatic Identification System (AIS) Information Links
The following links provide information on the technical characteristics and regulatory requirements of AIS:
The USCG Navigation Center website provides a good overview of AIS, how AIS works, explanation of the types of AIS and what they broadcast, sample AIS reports, and additional AIS references.
The IMO website outlines the international AIS carriage requirements.
Although several links are now dead, this site maintained by Marine Management Consulting in Seattle, WA still provides a wealth of information on AIS. Links are provided which cover everything from how AIS works to AIS Pilot Plug technical specs, to AIS installation guidelines. Definitely worth checking out if you still have AIS questions.