Vessel Tracking

COLREGS Give-Way Compliance Deficit

Counterfactual lateral distance measuring how far a give-way vessel fell short of a compliant collision-avoidance maneuver.

A COLREGS give-way compliance deficit quantifies navigational behavior during close vessel encounters under the International Regulations for Preventing Collisions at Sea. When two vessels enter a head-on, crossing, or overtaking encounter, Overwatch estimates role probabilities for the give-way and stand-on hulls across observed encounter epochs and solves for the minimum-effort starboard course alteration needed to clear a safe closest point of approach. The compliance deficit is the counterfactual lateral distance in nautical miles between the give-way vessel’s actual position at closest approach and that compliant reference path, rewarding partial evasive action over inaction while leaving ambiguous encounter geometries unforced. Persistent deficits in congested port approaches help surface unsafe navigation and shadow-fleet operating practices.

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