The wind in the vicinity of Nantucket Shoals Light has been southerly at an average speed of 23 mph. The predicted set and drift of the rotary current is 225° at 0.8 knot. What current should you expect?

Question

The wind in the vicinity of Nantucket Shoals Light has been southerly at an average speed of 23 mph. The predicted set and drift of the rotary current is 225&deg; at 0.8 knot. What current should you expect?

Accepted Answer

Option A: 235&deg; at 0.5 knot. Apply the vector addition method for wind-driven current modifications as described in Bowditch. Adjusting the predicted rotary current of 225 degrees at 0.8 knot for the southerly wind influence yields a resultant current of 235 degrees at 0.5 knot, consistent with local environmental data.

The wind in the vicinity of Nantucket Shoals Light has been southerly at an average speed of 23 mph. The predicted set and drift of the rotary current is 225&deg; at 0.8 knot. What current should you expect?

The wind in the vicinity of Nantucket Shoals Light has been southerly at an average speed of 23 mph. The predicted set and drift of the rotary current is 225° at 0.8 knot. What current should you expect?