October 23, 2o23 — A new analysis by National Oceanic and Atmospheric Administration shows more vessel operators are abiding by ship speed limits the agency sets to protect endangered North Atlantic right whales from ship strikes along the U.S. East Coast.
A few hours before the agency’s study came out, the environmental group Oceana issued an update in its own series of analyses tracking ship speeds. Its conclusion: far too many vessels are still breaking the recommended 10-knot limit when right whales are known to be in waters near U.S. ports.
Both reports rely on data from Automatic Identification System transmitters carried by most commercial vessels, which record their tracks at sea. AIS is chiefly a safety system – allowing vessel operators to broadcast their real-time positions and see where other ships and boats are in relation to them.
AIS data also allows observers to calculate real-time and past vessel tracks and speeds. NOAA and Oceana used the same data, but different methodologies to draw somewhat divergent conclusions.