BOTH INTERNATIONAL & INLAND While underway your vessel approaches a bend in a river where, due to the bank, you cannot see around the bend. Which action should you take?

Correct Answer: Option D — Sound one prolonged blast

Rule 34(e) specifically dictates that a vessel nearing a bend or an area of a channel where other vessels may be obscured by an intervening obstruction shall sound one prolonged blast. This signal must be answered with a prolonged blast by any approaching vessel that may be within hearing.