What is a common sign of dangerous water conditions while boating?

Red flags with white diagonal stripes are a widely recognized signal indicating dangerous water conditions. This flag is often used to warn boaters of hazards such as strong currents, rough surf, or other safety concerns in the area. When you see this flag displayed, it's important to exercise caution and be aware that conditions may not be safe for recreational activities like boating, swimming, or other water sports.

In contrast, clear skies and calm waters generally suggest safe boating conditions, which makes them less relevant as signs of danger. Low tide does not inherently indicate dangerous conditions, as this can vary based on the specific waterway and its characteristics. Awareness of navigation aids and warning signs like the red flag ensures that boaters can react appropriately to protect their safety and the safety of others on the water.