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Mind Your Knots: Watch Your Vessel Speed to Protect Large Whales When You Sail This Summer

June 18, 2026

Vessels 65 feet and above are required to travel at 10 knots or less while inside the Great South Channel Seasonal Management Area (April 1–July 31).
A full-body, high-angle shot of the Godspeed, a three-masted replica tall ship, sailing across calm, deep blue water under a bright blue sky with scattered, fluffy white clouds. The historic-style wooden vessel features a tan hull with bold black horizontal stripes and a decorative red-and-white diamond pattern along its upper railing. Tall ship ‘Godspeed’ at sea. Credit: Jamestown-Yorktown Foundation

Mariners: as you prepare your vessels to sail this summer, remember to watch your speed! Reducing your speed inside the Great South Channel Seasonal Management Area helps protect the endangered North Atlantic right whale. For instance, vessels participating in or watching events associated with the Sail 250 Celebration may cross the Great South Channel SMA while it is active.                              

Most vessels 65 feet or longer are required by law to travel at 10 knots or less in SMAs along the U.S. East Coast at certain times of the year. The Great South Channel SMA is active each year from April 1 through July 31. Going 10 knots or less in SMAs reduces the likelihood of deaths and serious injuries to endangered North Atlantic right whales that result from collisions with vessels. 

Should a regulated vessel need to exceed the 10-knot speed limit for safety while transiting within an active SMA, they must document the following information in the vessel’s logbook:

  • Reasons for the deviation
  • Speed at which the vessel operated
  • Latitude and longitude of the location(s) they exceeded 10 knots
  • Time and duration of the deviation

In addition, the captain must sign and date the vessel logbook affirming the documented information is accurate.

The Great South Channel SMA is confined in waters bounded by the following coordinates:

  • 42º30'N, 069º45'W
  • 42º30'N, 067º27'W
  • 42º09'N, 067º08'24"W
  • 41º00'N, 069º05'W
  • 41º40'N, 069º45'W, then back to the starting point
An informational graphic from NOAA Fisheries titled, "ATTENTION BOATERS WITH VESSELS 65 FEET OR LONGER: SLOW DOWN TO 10 KNOTS OR LESS FOR RIGHT WHALES."  The center contains a coastal map of the northeastern United States showing a red, polygon-shaped zone labeled Great South Channel SMA (April 1 – July 31) located in the Atlantic Ocean east of Cape Cod and Nantucket.
The Great South Channel Seasonal Management Area. Credit: NOAA Fisheries

NOAA recommends that all vessels go 10 knots or less in active Right Whale Slow Zones and Dynamic Management areas. These are areas where North Atlantic Right Whales have been detected. All boaters from Maine to Florida can sign up for email or text notifications about the latest Right Whale Slow Zones. 

Vessels are encouraged to report any sightings of North Atlantic right whales from Virginia to Maine at (866) 755-6622. Right whale sightings in any location may also be reported to the U.S. Coast Guard via channel 16 or through the Whale Alert app.

You can reach the Northeast Office of Law Enforcement at (978) 281-9213 (select “option 2” for regulatory compliance) or nmfs.ole.ned@noaa.gov

Last updated by Greater Atlantic Regional Fisheries Office on June 29, 2026