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- Master & Mate (Oceans or Near Coastal (Limited Tonnage: Less Than 200 GRT)) »
- Q150 - Deck General
133. You observe a V-shaped ripple with the point of the V pointing upstream in a river. What may this indicate?
A V-shaped ripple pointing upstream typically indicates a towed-under buoy. This pattern results from the current forcing water to flow around the submerged buoy, creating the characteristic V-shape with the point directed upstream. While submerged objects can create surface disturbances, only a towed-under buoy consistently produces this specific pattern; wrecks and rocks that are not dangerous to navigation are generally too deep to cause such a visible ripple.
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