Midship Marine starts 48-meter Hy-Line catamaran ferry for island routes

Midship Marine has started construction on a new 48-meter catamaran ferry for Hy-Line Cruises, and the numbers tell you this is not a vanity build. The Incat Crowther design is being put together in Harvey, Louisiana, for routes between Hyannis, Massachusetts, Martha’s Vineyard and Nantucket, with capacity for up to 493 passengers across three decks.

That scale matters on the Cape Cod islands run, where Hy-Line has spent decades refining high-speed service around seasonal surges, tight schedules and weather that can turn an ordinary crossing into a slog. Incat Crowther says the ferry is designed for local conditions off Cape Cod and can exceed 30 knots, the kind of speed that helps keep island service on time and keeps utilization high when every round trip has to earn its keep.

Hy-Line’s own history shows why the company keeps leaning into this formula. It was founded in 1962 as Hyannis Harbor Tours, then bought the Nantucket Boat Company’s fleet, facilities and Hy-Line trade name in 1972. Since then, the operator has built a business around high-speed ferry service, including what it says is the only year-round high-speed ferry to Nantucket and seasonal service to Martha’s Vineyard from Hyannis and Oak Bluffs.

This latest build also fits a clear fleet pattern. Hy-Line introduced its third-generation high-speed catamaran, Grey Lady, in 2003, launched Martha’s Vineyard service in 2005 and added Vineyard Lady in 2015 as it moved toward all high-speed service on that route. Incat Crowther also points to Grey Lady IV, a 493-passenger catamaran delivered to Hy-Line in 2016 by Gladding-Hearn Shipbuilding, which was commissioned in response to rising ridership.

That earlier 493-passenger precedent is the telling part. Hy-Line is not experimenting with a new capacity bracket or a new operating model; it is repeating a formula that has already worked in its own fleet, only with Midship Marine building the next hull instead of Gladding-Hearn. For operators watching the U.S. ferry market, the message is straightforward: large passenger catamarans still have a live commercial case when the route is dense, the timetable is unforgiving and the boat has to move people fast without giving up deck space or stability.