The ornamental design for a bracket for mounting a thruster to a boat, as shown and described.
FIG. 1 is a perspective view of the bracket of the present invention.
FIG. 2 is a front elevational view.
FIG. 3 is a rear elevational view.
FIG. 4 is a side elevational view, the appearance being the same from either side, except that the respective side views are mirror images of each other.
FIG. 5 is a top plan view; and,
FIG. 6 is a bottom plan view.
The broken lines are for the purpose of illustrating portions of the article that form no part of the claimed design.