What should be used in conjunction with sight to keep a proper lookout?

Using hearing in conjunction with sight is important for maintaining a proper lookout while boating. This is because many potential hazards or other vessels may not be visible but can be detected by sound. For instance, the sound of an approaching boat, the whistle of a vessel, or even natural sounds can alert a boater to nearby dangers or changes in the environment.

Relying solely on sight could lead to missing critical cues that can only be perceived through hearing, especially in situations where visibility is reduced, such as fog or at night. Therefore, combining both senses enhances overall situational awareness and safety on the water.

Other options such as sunshine and wind direction can provide useful information, but they do not enhance a boater's ability to detect other vessels or hazards. Similarly, while radar technology is a valuable tool for navigation and lookout, it does not substitute for the fundamental human senses of sight and hearing, especially in conditions where technology might fail or not provide the same immediate insights as using one’s senses together.