A navigation light system for a watercraft including multiple lights of a
common color and that are spatially separated on the watercraft to
collectively operate as a navigation running light that has a specified
horizontal beam sector of less than 360 degrees. Each light is separately
masked to emit light outwardly from the watercraft within a partial arc
horizontal beam sector which is less than the specified horizontal beam
sector. The navigation light system may include first and second running
lights of first and second colors, respectively, where each running light
includes multiple commonly-colored lights that are separately masked
within a corresponding one of mutually exclusive partial arc horizontal
beam sectors within the specified horizontal beam sector.