I claim the ornamental design for a blind unit for a yacht deck hatch, as shown and described.
FIG. 1 is a perspective view of the blind unit for a yacht deck hatch showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a rear view from one end thereof;
FIG. 5 is a front view from the opposite end thereof;
FIG. 6 is a left side view thereof; and,
FIG. 7 is a right side view from the other side thereof.
The broken lines in the drawings depict portions of the blind unit for a yacht deck hatch that form no part of the claimed design. The blind unit for a yacht deck hatch is shown in a closed position.