Tool for fog navigation

• A. Radar guidance
• B. GPS maps
• C. Visual landmarks
• D. Compass, sound signals

Answer: (D)

Fog navigation hinges on non-visual cues, so the most reliable approach is to rely on a trustworthy heading and clear communication. The compass gives you a stable sense of direction when you can’t rely on shorelines or landmarks, allowing you to hold or steer to your planned course even in dense fog. Pairing that with sound signals—like a whistle or bell—lets other vessels know you’re present and moving, which greatly reduces the risk of collisions when visibility is low. Radar and GPS can be helpful tools in other contexts, but they don’t replace the need to maintain a specific heading and actively communicate your presence in fog. Visual landmarks are unusable in dense fog, so they can’t assist with navigation at all. This combination of a reliable heading and audible signaling is the safest, most practical approach for foggy conditions.