What is the primary function of a radar system in navigation?

The primary function of a radar system in navigation is to detect and track the position of vessels and obstacles. Radar systems emit radio waves that bounce off objects in their path, allowing the navigator to determine the position, distance, and speed of nearby vessels and landmasses. This capability is crucial for maintaining situational awareness, particularly in low visibility conditions such as fog or heavy rain, where visual navigation may be compromised.

Using radar, mariners can effectively avoid collisions and navigate safely through busy shipping lanes or near coastlines. The ability to see both stationary and moving objects on a radar display enhances overall navigational safety and efficiency.

The other options, while related to various aspects of navigation and maritime practice, do not accurately capture the core purpose of radar. Navigating by stars pertains to celestial navigation techniques, which rely on the position of celestial bodies rather than technology. Calculating distance to the shoreline can be done with other navigational aids, but is not the primary function of radar systems. Monitoring weather patterns is essential for safe navigation but is typically handled through other means, such as satellite and weather forecasting systems.