How many shades of navy grey are there?

How many different shades of navy grey have navies officially used?

From memory, roughly 192 appeared on one research color chart, illustrating that navy grey is a large family of official shades rather than one color.

There is no single definitive navy grey. A color chart assembled during doctoral research on uniforms and naval colors reportedly covered roughly four A4 pages of grey samples. At about 48 boxes per page, that produces a memory-based estimate near 192 official shades. The exact number is explicitly qualified, but the example shows how national standards, periods, and paint specifications multiply what looks like a single color.