What is the primary purpose of Precision Runway Monitoring (PRM)?

The primary purpose of Precision Runway Monitoring (PRM) is to track inbound aircraft on Instrument Landing System (ILS) approaches. PRM is a specialized surveillance tool that allows air traffic controllers to maintain safe separation between closely spaced parallel runways. It enhances the precision and safety of approach operations, especially in busy terminal airspaces. By providing detailed, accurate information about aircraft position, speed, and flight path, PRM enables controllers to effectively manage multiple aircraft approaching the runways at the same time, thus improving operational efficiency.

The other options focus on aspects not related to the primary function of PRM. Managing ground traffic, assisting with takeoff procedures, and providing weather updates do not align with the specific role of monitoring aircraft during their approach phases. Instead, those responsibilities fall under different systems and protocols within air traffic management and airport operations.