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All questions
Limitations

Why must a small craft remain in the risk picture when its echo fades in rough water?

Short answer

Aspect and set-up can weaken a real return; collision risk remains

Echo strength is conditional. A fading return does not remove the physical contact: track it with repeated, independent evidence. Revisit Echo Strength, Aspect, and Reflectors.

Quick check

Why must a small craft remain in the risk picture when its echo fades in rough water?