When checking CPA (Closest Point of Approach) and TCPA (Time to Closest Point of Approach), always remember—ships can change course or speed at any time. Don’t ever assume the other vessel will follow COLREGs perfectly, or take the right action. Just like on the road, there are reckless drivers at sea too. That’s why it’s critical for you to always follow the COLREGs and use Rule 2 and Rule 17 when needed. Your CPA measurements usually reference the bridge or radar antenna, depending on your rad
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