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

Under Inland Navigation Rules, for the condition where 'While underway your vessel approaches a bend in a river where, due to the bank, you cannot see around the bend. You should', the correct requirement is: 'sound one prolonged blast'. This standard ensures clear navigational intent and collision avoidance.