Automatic Identification System facts for kids

The Automatic Identification System (AIS) is a clever radio system that helps ships stay safe at sea. Think of it as a way for ships to "see" and "be seen" by others, even in bad weather or at night.

Every few seconds, an AIS device on a ship sends out messages. These messages tell other ships and special stations on land exactly where that ship is. They also share information like the ship's name, speed, and direction. Ships know their own location using Global Positioning System (GPS).

Since 2004, most large ships (over 300 tons) and all passenger ships must use AIS. The main reason for this system is to help ships avoid crashing into each other. It's like having an extra pair of eyes on the water!

• 

  A ship can see where other ships are (this is the English Channel)

• 

  A person on land can tell ships where to go

Images for kids

• 

  An AIS-equipped system on board a ship presents the bearing and distance of nearby vessels in a radar-like display format.

• 

  A vessel's text-only AIS display, listing nearby vessels' range, bearings, and names

• 

  System overview from US Coast Guard

• 

  AIS message GMSK modulation signal example

See also

In Spanish: Sistema de Identificación Automática para niños