Which two elements can a boater trust for navigation?

Using your eyes and a chart together offers a reliable way to navigate while boating. The chart provides detailed information about the waterway, including depths, hazards, and navigational aids. By observing the environment—such as landmarks, markers, and other visual cues—a boater can confirm their position on the chart and make informed decisions. This method combines the map's data with real-time visual references, creating a comprehensive understanding of the surroundings and ensuring safer navigation.

While the other options involve useful tools for navigation, they each have limitations. Relying solely on GPS may lead to issues such as signal loss or inaccuracies, while experience and intuition vary greatly among individuals and might not always lead to safe decisions. A compass and radar are valuable, but they can be less of a standalone solution for a visual understanding of the environment compared to the direct visual confirmation provided by using both your eyes and the chart.