The Universal Shipborne Automatic Identification System (AIS) is a system of transponders installed on vessels which transmit over two dedicated digital marine VHF channels. The data is sent from each vessel every few seconds and contains position and movement information such as course, speed, latitude, longitude, and rate of turn. Static information about the vessel is sent every few minutes and includes the name, type of ship, length, beam, draft, etc. Nearly all commercial ships are mandated to carry AIS transponders and each year more yachts, launches and work boats are fitting AIS equipment.
Articles in this section
- What is AIS?
- What kinds of vessels will be visible to me?
- How often is AIS information received?
- Should I use a splitter or a dedicated VHF antenna?
- Can I use my existing VHF antenna?
- What can I do if I'm hearing too many alarms?
- What apps can I use on iPad, iPhone and Android?
- What is the difference between types of AIS equipment?
- Who uses AIS?
- Using marinetraffic.com to test if you are transmitting