Question 1538Navigation General

The correct answer is B) A sideways movement of your vessel. When a descending vessel advises you to "watch for the set" above a certain point, it is referring to the sideways movement or set of your vessel due to the river current. The set is the direction the current is pushing your vessel, which can cause it to move sideways if not properly compensated for by adjusting your heading. This is a common navigational challenge when operating on rivers with strong currents. The other options are incorrect because: A) Shallow water is not necessarily indicated by the "set" warning. C) Slack water refers to a lack of current, which is the opposite of what the warning is indicating. D) An increase in current velocity may or may not be the cause of the set, the key issue is the sideways movement of your vessel.