Deep, dark, uniform blue, almost black, like a midnight sea.
Navy is a black, close to blue.
It can be described as deep, rich, inky and very dark.
Set in white, because white reads best on it.
A navy, naval force, military maritime fleet, war navy, or maritime force is the branch of a state's armed forces principally designated for naval and amphibious warfare; namely, lake-borne, riverine, littoral, or ocean-borne combat operations and related functions. It includes anything conducted by surface ships, amphibious ships, submarines, and seaborne aviation, as well as ancillary support, communications, training, and other fields.
Read on WikipediaNavy blue, also known simply as navy, is a dark shade of the color blue. The name navy blue originally referred to the color of uniforms worn by officers in the Royal Navy. In the late 18th century, the Royal Navy adopted the color for its sailors' uniforms, partly due to the practical reason that dark colors were less prone to showing dirt and wear during long sea voyages. The color became so associated with naval service that it came to be known simply as "navy blue."
Read on WikipediaProper noun