USCG-OUPV-L2.5

Sound signals — and the difference that matters most

USCG-OUPV-M2 · Rules of the Road (exam module Q100) · USCG-OUPV-M2-A Inland and International rules of the road — 50 questions at a 90% pass mark, with no references permitted.

Internationally, a whistle signal tells other vessels what you **are doing**. Inland, it tells them what you **intend to do** — and it demands an answer. That single change reshapes how vessels talk to each other, and the exam knows it.