CAMBRIDGE — The American Cruise Lines’ newest ship, American Constellation, is berthed this week at Long Wharf while the company completes training exercises for the crew. The American Constellation is the newest river cruising ship commissioned by American Cruise lines, and is preparing to begin its inaugural cruising season the first week in May. The Constellation first met the waters of the Chesapeake Bay on July 12, 2016, when it was launched in the Wicomico River. The boat was constructed by Chesapeake Shipbuilding in Salisbury, which has been completing the installation of the top decks and interior outfitting since the initial launch. The new ship has a capacity of 175 passengers and is scheduled to begin this season with a Chesapeake Bay cruise starting out of Baltimore on May 6. The cruise will take in Yorktown and Williamsburg, Crisfield and Tangier Island, Cambridge, Oxford, St. Michaels and Annapolis before heading back to Baltimore after eight days on the water. The company will offer two of its Chesapeake Bay cruises on the American Constellation back to back, one on May 6 and one on May 13, before sailing for New England and spending the summer providing cruise packages of the coastal New England states. The American Constellation is outfitted with 89 staterooms, some as large as 450 square feet, and all with either a private balcony or opening picture window. There is elevator access to all decks, and a grand dining room that accommodates all passengers. American Cruise Lines boasts of more than 35 itineraries ranging from 4 to 21-nights in length, which visit the Pacific Northwest, Alaska, New England, the Southeast and the Mississippi River. Chesapeake Shipbuilding in Salisbury has built all of the new vessels for American Cruise Lines in recent years. According to a press release issued by the company, Chesapeake Shipbuilding designs and builds both inland and ocean going vessels between 100 and 400 feet that operate worldwide. In 2016, Chesapeake Shipbuilding had seven large vessels under construction, including American Cruise Lines ships and tugboats for Vane Brothers of Baltimore.