Why do ships use port and starboard?

Answer: Avoids confusion of left/right

Avoids confusion of left/right ✓ — Correct! Left and right are relative to which way you're facing. Port (left side) and starboard (right side) are fixed to the ship itself. When giving commands, port/starboard eliminate confusion about perspective—everyone knows which side regardless of which direction they're facing.

Traditional nautical language only — Wrong. While traditional, these terms serve a critical safety function: they provide unambiguous directional references that don't depend on perspective.

Required by international law — Wrong. While maritime conventions require these terms, the basic reason is safety—port/starboard provide clear, perspective-independent directional references.