June 14, 1976 : Detroit
Srila Prabhupada took his morning walk on Belle Isle again. As we walked, a boat sounded a loud blast on its horn. One of the devotees, who seemed to know about things nautical, complimented Srila Prabhupada. "The captain of that boat must know that you're here on the island today, because those whistles that he just blew were salutes. It's a master salute from the best man to the best man. He must know that you are here." Srila Prabhupada smiled at his disciple's sentiment and all the devotees cheered, "Jaya! Haribol!"
Reference: Transcendental Diary - Volume 2