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Automatic Identification Systems (AIS) are a navigation safety device
that transmits and monitors the location and characteristics of many
vessels in U.S. and international waters in real-time. This dataset
represents the density of vessel traffic in 2013 for the contiguous
United States offshore waters from vessels with AIS transponders in 100
meter grid cells. The dataset is best interpreted using a high to low
density scale and does not represent actual vessel counts. This dataset
has been resampled to a 300m x 300m resolution.
Layers in this dataset are based on combinations of the following options.
You may choose from these options to select a specific layer on the map page.