What is the main purpose of the compass rose on a nautical chart?

The main purpose of the compass rose on a nautical chart is to show true north orientation. The compass rose provides essential information about the direction on the chart, indicating the cardinal points (north, east, south, and west) as well as the intermediate points. Navigators use this orientation to accurately align their course with the chart and to help determine bearings that are crucial for safe navigation. By understanding true north, mariners can better plot their paths, assess their positions, and navigate in relation to land and other navigational aids. This foundational tool is vital in ensuring that vessels maintain the correct course over water.