There could be a fair amount of boat movement near Bay Shipbuilding in Sturgeon Bay as two large vessels leave for the Great Lakes shipping lanes this week. The tentative schedule calls for the 1,000-foot Paul R. Tregurtha to leave Tuesday & the Edgar A. Speer, another 1,000-footer, to head out on Thursday. Three other vessels are expected to leave early next week. The century old Saint Mary’s Challenger, which is being retrofitted for a new purpose, is expected to remain in port until May 15th.