Some fishing vessels use AIS transponders on their fishing gear—this is particularly common with longline vessels. In Starboard these are generally identified as buoys.
By default buoys are turned off; however, you can add them as a map layer.
Buoys that consistently have tracks around a vessel are likely associated with that vessel. Selecting these buoys can provide a much more detailed view of a vessel’s fishing activity. This can be particularly helpful when a vessel has missing AIS data.