VMS (Vessel Monitoring System) data tracks vessels in a similar way to AIS but this data has historically been restricted to government regulators or other fisheries authorities. Several countries have decided to release their VMS publically on Global Fishing Watch. VMS systems transmit positions at set intervals (we have worked with systems transmitting positions from every ten minutes to just once every four hours) and some systems allow operators to increase transmission frequency when needed. Some vessels broadcast both AIS and VMS and because both systems include the same basic information (time, latitude, longitude, course, speed), they can be easily combined to give a higher resolution vessel track.
- What is AIS?
- What vessels are required to use AIS? What are global regulations and requirements for vessels to carry AIS?
- Does Global Fishing Watch track illegal activity? Has Global Fishing Watch ever identified illegal fishing activity?
- What is a carrier vessel?
- What are the different vessel tracking systems out there and how can they be used together?