What occurs on the CRT face of the PPI display during each 360-degree rotation of the radar antenna?

During each 360-degree rotation of the radar antenna, one full sweep of the radar is displayed on the CRT (cathode-ray tube) face of the PPI (plan position indicator) display. This sweep provides a continuous measurement of the environment around the vessel, capturing targets and obstacles in the radar's range.

The display updates in real-time as the antenna rotates, allowing operators to visualize the relative positions of detected objects. This is critical for navigation and situational awareness, as it helps in identifying potential hazards and making decisions based on the surrounding maritime conditions. Each sweep represents a comprehensive scan of the area within the radar coverage, thus providing essential information for safe navigation and operational planning.

This functionality is central to how radar systems work, as it ensures that all objects within the coverage area are accurately represented on the PPI display during each complete rotation of the antenna.