Brown, green, blue, and true-blue water navies

Where are the breakpoints between brown-, green-, and blue-water navies?

There are no sharp breakpoints; the terms broadly distinguish inland, nearby-sea, regional-oceanic, and genuinely global operating reach.

After an initial mix-up, the categories are corrected. Brown-water forces operate on rivers and inland waters, while green-water forces reach nearby seas. Blue-water navies can conduct regional deep-ocean operations, and true-blue-water navies can deploy globally. These are broad descriptions of reach and support capacity rather than rigid tonnage thresholds.