The act or the science or the business of traversing the sea or other waters in ships or vessels. Pollock v. Cleveland Ship Building Co., 56 Ohio St. G55, 47 N. E. 582; The Silvia, 171 U. S. 402, 19 Sup. Ct. 7, 43 L. Ed. 241; Laurie v. Douglass, 15 Mees. & W. 746.