FIG. 1 is a top plan view of the marine throw ring of the present design. FIG. 2 is a bottom plan view of the marine throw ring shown in FIG. 1. FIG. 3 a front plan view of the marine throw ring shown in FIG. 1. FIG. 4 is a top perspective view of the marine throw ring shown in FIG. 1; and, FIG. 5 is a bottom perspective view of the marine throw ring shown in FIG. 1.