VMS systems broadcast positions at set intervals and some systems allow operators to increase transmission frequency when needed.
Several countries have released their VMS publically on the Global Fishing Watch map. VMS tracks vessels in a similar way to AIS, but has historically been restricted to government regulators or other fisheries authorities.
The number of fishing vessels with AIS is increasing by 10 to 30 percent each year, making this technology more and more informative with time. While only two percent of the world’s roughly 2.9 million fishing vessels carry AIS, they are responsible for over half of the fishing effort that takes place more than 100 nautical miles from shore, and as much as 80 percent of the fishing that occurs on the high seas. Ground stations and satellites pick up this information, making vessels trackable even in the most remote areas of the ocean.
Each year, more than 400,000 AIS devices broadcast vessel location, identity, course and speed information. The International Maritime Organization and other management bodies require large ships, including many commercial fishing vessels, to broadcast their position with AIS in order to avoid collisions.
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