The is the estimated position where the distance between two ships (the "own ship" and a "target vessel") reaches its absolute minimum. It is the primary metric used by Watchkeeping Officers to assess the Risk of Collision (ROC) . If the CPA is too small, a collision is possible, requiring immediate maneuvering according to COLREGs . 2. Core Parameters The method relies on two primary mathematical outputs:
Incorporating Rate of Turn (ROT) and Change of Speed (COS) into AIS-based predictions for more accurate results during maneuvers. Ocean CPA method.pdf
Modern "Ocean CPA" calculations typically integrate data from two primary systems: The is the estimated position where the distance
More details on reliability in CPA calculations If you'd like, I can provide: The specific
💡 While the basic CPA method provides a "point-in-time" safety check, modern ocean navigation requires combining CPA with Ship Domain models to ensure reliable collision avoidance in busy shipping lanes. If you'd like, I can provide: The specific mathematical formulas for DCPA and TCPA A summary of COLREG rules related to collision avoidance