What is the Automatic Identification System (AIS)?
A description of AIS on the U.S. Coast Guard site. There are also a number of pages on this site related to how AIS works and information on the various applicable standards.

Rose Point Navigation Systems
Home page for Rose Point Navigation Systems, manufacturer of the Coast Explorer marine navigation product.

Comar Systems
Home page for Comar Systems, manufacturer of our new line of AIS products. Comar's "AIS in Action" page can be found here.

ACR Electronics
Home page for ACR Electronics, manufacturer of the Nauticast AIS Transponder  products.

Ship Plotter
A good starter package for exploring AIS on your PC.

MarineTraffic.com
This site has AIS tracking with Google maps for many vessels from ports around the world.

Ship Plotting
A community site of AIS sharers from around the world.  The site allows anyone that owns an AIS receiver to upload their data (ships) to the site and view the data in real time via the web.  The site has lots of features to explore once you have your feed setup.

BoatingSF.com
This site has a very cool animated display of shipping traffic in San Francisco Bay as well as a list of vessels that were seen with AIS over the last few months.

AIS Parser SDK
Need to use AIS data in software applications? Check out this toolkit which allows you convert AIS sentences into useful formats.

Siitech Instant AIS Receiver Test
See vessel traffic on Google and Microsoft maps in 5 minutes. Web-based marine traffic monitoring on NOAA charts. Alarms, reports, history replay. AIS Server to build AIS network.