The act or the science or the buslness of traversing the sea or other waters In ships or vessels. Pollock v. Cleve-land Ship Building Co., 56 ohio St. 655, 47 N. E. 582; The Silvia, 171 U. S. 462, 19 Sup. Ct 7, 43 L. Ed. 241; LAurie v. Douglass, 15 Mees. & W. 746