What type of line is used to measure lateral separation between ships?

The correct choice involves using a Phone and Distance Line for measuring lateral separation between ships. This specific type of line serves as a communication tool that allows vessels to maintain a safe distance while navigating. By using a Phone and Distance Line, crew members can communicate critical information about their positions and intended maneuvers, ensuring that they maintain adequate lateral separation, which is vital for avoiding collisions and ensuring safety in crowded waterways.

The term "Phone and Distance Line" highlights the integration of direct communication along with a physical measure of distance, which is essential when determining how far apart ships should be from one another in real-time situations. This allows for dynamic adjustments based on the current maritime environment.

In contrast, the other options pertain to different functions or tools that do not specifically address the dual need for distance measurement and communication while maintaining lateral separation between ships. Understanding the unique role of the Phone and Distance Line is crucial for maritime navigation and seamanship when managing the proximity of vessels effectively.