2022 Trial Slowdown

For a full-size map of the slowdown, click here

Slowdown Parameters for 2022

Dates: October 24, 2022-January 12, 2023

Location: Admiralty Inlet and north Puget Sound

The voluntary vessel slowdown trial takes place in the inbound and outbound lanes of the shipping lanes within these boundaries:

Northwest boundary of the slowdown: a line drawn between Pt Hudson (48.117264, -122.748907) and Admiralty Head (48.154217, -122.679503)

Northeast boundary of the slowdown: a line drawn between Randall Pt (47.983237, -122.352871) and the Mukilteo Lighthouse (47.948181, -122.308043)

Southern boundary of the slowdown: a line drawn between Apple Cove Pt (47.815535, -122.480885) and Edwards Pt (47.803340, -122.394924)

The slowdown area excludes Hood Canal.

For a full-size map of the slowdown area click here.

When it is safe and operationally feasible, ships are encouraged to transit the slowdown area at or below the following speeds through water:

  • 14.5 knotsspeed through water or less for vehicle carriers, cruise ships, and container vessels
  • 11.o knots speed through water or less for bulkers and tankers

Estimated transit time impacts:
Transiting through the slowdown area at the reduced speed could add 10 to 20 minutes to the total transit time, depending on the vessel type and water currents.

Benefits to Participants:
Fleets with high rates of participation are eligible for documentation to meet a criterion in the Underwater Noise performance indicator for their Green Marine certification

How can the public help this initiative?

Members of the public can help commercial mariners avoid whales by reporting whale sightings through:

For more information:

  • Download the slowdown fact sheet for more details
  • Sign up for the Quiet Sound slowdown newsletter here
  • Questions? Contact us at info@quietsound.org. Pilots with questions about the slowdown can text or call Quiet Sound at ‪(360) 218-2307‬ from 8 am to 5 pm Monday through Friday.
  • Learn more about concurrent slowdowns for whale protection in Canadian waters on the ECHO site


Quiet Sound recognizes the essential contributions of the Leadership Committee and working groups who provided input on this first trial slowdown. We also thank the ECHO program for their mentorship in setting up a voluntary slowdown zone. Puget Sound Pilots are playing a pivotal role in the on-water success of this effort. The Marine Exchange of Puget Sound is providing AIS data, and the Marine Exchange and Pacific Merchant Shipping Association have been key partners in communicating the slowdown to the maritime industry.

We thank all the tribal governments who considered our proposal to put forward this program for vessels traveling through their usual and accustomed fishing areas.

Quiet Sound gratefully acknowledges all the partners who are working to provide Washington mariners with real-time whale locations, including: Ocean Wise, Orca Network, Acartia, Conserve.io, and all the members of the public who report sightings.

Funding for this work was provided by the Washington State Legislature, US Environmental Protection Agency, and the National Fish and Wildlife Foundation.

Quiet Sound

Subscribe to stay connected