The ornamental design for a boatwindshield, as shown and described.
FIG. 1 is a left side elevational view of a first embodiment of a boat windshield design of the present invention with broken lines illustrating a shape of a boat and broken lines illustrating a door swivel assembly of the windshield;
FIG. 2 is a left side elevational view similar to FIG. 1 without the broken lines;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a perspective view thereof;
FIG. 7 is a left side elevational view of a second embodiment of a boat windshield design of the present invention with broken lines illustrating a shape of a boat;
FIG. 8 is a left side elevational view similar to FIG. 7 without the broken lines;
FIG. 9 is a right side elevational view thereof;
FIG. 10 is a front elevational view thereof;
FIG. 11 is a top plan view thereof; and,
FIG. 12 is a perspective view thereof.
The broken lines illustrate portions of a boat and a door swivel assembly which form no part of the claimed design.