MV Grey Lady IV is a high-speed catamaran ferry operated by Hy-Line Cruises that runs on a route between Hyannis and Nantucket, Massachusetts.
Hy-Line's request to regulator Woods Hole, Martha's Vineyard and Nantucket Steamship Authority to construct the ship that would become Grey Lady IV was approved in May 2014,[1] and the vessel was ordered from Gladding-Hearn Shipbuilding in February 2015.
[4] However, delays during construction meant that she was not launched until July 6, and Hy-Line finally took delivery on August 31.
[3] Grey Lady IV entered service on September 2.
[3] She is powered by four Cummins diesel engines working through Twin Disc gears which drive quad HamiltonJet HM721 waterjets, which give her a top speed of 34 knots (39 mph) when loaded.