USCG-OUPV-L3.4
Tides and currents
USCG-OUPV-M3 · Navigation General (exam module Q171) · USCG-OUPV-M3-A Aids to navigation, the compass, charts and publications, tides and currents. 50 questions at 70%.
Tide is vertical — it decides whether you float. Current is horizontal — it decides where you end up. They come from the same cause and they are answered from different books, and confusing them is the fastest way to run aground while navigating perfectly.
AI-drafted catalogue content pending SME review. USCG requirements change; verify every figure against the National Maritime Center and the current CFR before relying on it for an application.