What is the lowest range scale that IMO requires ARPA facilities to be available on?

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Multiple Choice

What is the lowest range scale that IMO requires ARPA facilities to be available on?

ARPA is meant to assist with collision avoidance by automatically plotting targets and calculating metrics like CPA and TCPA. The lowest radar range scale on which ARPA facilities must be available is 3 miles. This ensures you have ARPA functioning at a mid-range view, giving you early enough warning to assess risks and take action in time. Scales smaller than that would limit ARPA’s usefulness for detecting evolving threats early, while a 6-mile scale is larger than the minimum requirement. Keeping ARPA available at 3 miles provides a practical, reliably useful capability across typical traffic situations.

ARPA is meant to assist with collision avoidance by automatically plotting targets and calculating metrics like CPA and TCPA. The lowest radar range scale on which ARPA facilities must be available is 3 miles. This ensures you have ARPA functioning at a mid-range view, giving you early enough warning to assess risks and take action in time. Scales smaller than that would limit ARPA’s usefulness for detecting evolving threats early, while a 6-mile scale is larger than the minimum requirement. Keeping ARPA available at 3 miles provides a practical, reliably useful capability across typical traffic situations.

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