On Tuesday, authorities in Broward County, Fla. — where the cruise ship with four dead and two in dire need of medical attention hopes to dock this week — said a plan presented by owner Carnival Corp. does not yet address all their concerns. A representative for the U.S. Coast Guard said the Zaandam and an accompanying ship would not be allowed to enter U.S. waters without submitting “a complete plan for self-support of the medical issues occurring on board the vessels.” At a meeting Tuesday, Coast Guard Capt. Jo-Ann Burdian said a “unified command” — a group of local,...