The MV Sealth is a Issaquah-class ferry operated by Washington State Ferries. She is named for Chief Sealth. The Sealth underwent cabin rebuilding in last 2006, after which she was in service on the Fauntleroy-Vashon-Southworth route. The Sealth was then the #2 vessel on the route. Earlier she was taken out of service due to a seam needing weld repairs.^[3]

The Sealth was not listed to return to the San Juan Islands in late 2015. She was in service at Seattle/Bremerton and switched to the Vashon route mid-fall and she remained there until the Winter 2016 schedule began. She replaced the MV Klahowya as the inter-island ferry in the San Juans when it was retired. She is currently on the San Juan’s inter-island and San Juans Anacortes routes during low traffic times of day.

On November 7, 2012, the Sealth was serving the Bremerton run when a hole four feet under the waterline at No. 2 end port side was discovered.^[4] The ferry was pulled from service in the day and the leak was fixed a week later at Dakota Creek Shipyard of Anacortes. This caused the MV Salish to be put on the run, causing a loss of 30% percent of the run's regular car capacity.

In 1991, the Sealth collided with the MV Kitsap in Rich Passage in heavy fog. No major damage was reported.