The U.S. Coast Guard is seeking information about an unnamed sailing vessel that is 24 hours overdue en route from Montauk to Nantucket. In a notice to mariners, Coast Guard is asking for information about a 25-foot sailing vessel. The occupant onboard is John Mahoney, 45. The Coast Guard began sending out the notice this morning. “All mariners are requested to keep a sharp lookout,” according to the notice.