Last updated: 2026-04-14Contact: developer@captaincalc.com.tr
Reference basis: IMO/COLREG/STCW concepts, nautical practice, approved ship documents, and CaptainCalc calculation notes. Always verify operational decisions with official sources.
CPA / TCPA Calculator
Calculate closest point of approach and time to CPA from own ship and target motion data for a quick collision-avoidance check.
Relative-motion note
Assumes constant course and speed for both vessels. Use approved ARPA or radar plotting procedures for operational decisions.
Related Guides
CaptainCalc performs these bridge calculations instantly and offline with a workflow built for merchant ships.
