Prominent landmarks such as towers, smoke stacks, and flagpoles are pinpointed by a standard symbol of a dot surrounded by a _____________.

The correct answer is a circle, which serves as a standard symbol to represent prominent landmarks on nautical charts. The dot at the center signifies the specific landmark itself, while the surrounding circle conveys its significance as a navigational reference point. This convention helps mariners easily identify various types of landmarks, such as towers, smokestacks, and flagpoles, which are crucial for navigation and situational awareness on the water.

Using a circle in cartography has become a widely recognized practice, allowing for uniformity and clarity when reading nautical charts. Understanding how these symbols are used is essential for safe navigation, as it helps boat crew members quickly locate important features and avoid potential hazards.