NEW YORK — Britain's Prince Harry has toured a UNICEF operations center on the second day of a visit to New York City. The 25-year-old prince nodded and asked questions Saturday as he was briefed by staffers at the United Nations agency. Among other things, he learned how UNICEF used mapping technology to pinpoint aid sites in Haiti after the earthquake. The visit lasted about an hour. Later he headed for Citi Field, where he was to throw out the first pitch at a baseball game between the New York Mets and the Minnesota Twins. On Friday, Harry joined cadets in training at West Point. Harry is third in line to the British throne. He is the younger son of Charles, Prince of Wales, and the late Diana, Princess of Wales.