The ornamental design for a navigationalinstrument for determining the course sector of a watercraftilluminated according to regulations, as shown and described.
FIG. 1 is a top view showing my novel configuration for a navigational
instrument for determining the course sector of a watercraft illuminated
according to regulations, wherein the top left sector is shaded to
represent the color red and the top right sector is shaded to represent
the color green, with the bottom sector being white, thus representing a
preferred embodiment with regard to colors selected for the sectors of the
annulus;