The ornamental design for a boat, as shown and described.
FIG. 1 is a front perspective view of a boat showing my new design;
FIG. 2 is a rear perspective view thereof with the dinghy being lowered
condition;
FIG. 3 is a side perspective view thereof with the dinghy in lowered
condition. A portion of the mast and bowsprit is shown broken away for
convenience of illustration;
FIG. 4 is a partial top view showing the front portion thereof; and,
FIG. 5 is a partial top view showing the rear portion thereof.