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Great-circle distance using the Haversine formula on the WGS84 reference ellipsoid (mean radius 3440 nm). The result is the shortest distance over the surface between two points; actual passage distance is longer when you follow rhumb-line tracks for ease of navigation, route around weather or ice, or take traffic-separation schemes. The estimator returns ±2-3% of typical commercial routing distance for most port pairs.
Passage time = distance ÷ speed. Speed is measured at sea, not in port. Add port stays (typically 12-48 hours per call) on top of the cumulative steaming time. The plan includes anchorage time at the destination if you set 'arrival anchor hours'.
Type at least 3 characters of the port name or UN/LOCODE. The picker matches against ports.json (17,600+ ports). UN/LOCODE is the fastest match — try SGSIN for Singapore, NLRTM for Rotterdam, USNYC for New York. The autocomplete is case-insensitive.
No — this is a straight great-circle estimator. For Suez, Panama, or other canal routings, build the voyage as a multi-leg with the canal entrance and exit as waypoints (e.g. EGSUZ then EGPSE for a Suez transit). For weather routing, use a dedicated commercial product (StormGeo, AWT, ARM) or your operator's voyage-planning system.
Enter ports by UN/LOCODE or name (e.g. SGSIN, NLRTM, USNYC) to plan a multi-leg voyage. Distances are great-circle, in nautical miles. Passage time = distance ÷ speed. Add port-stay hours between legs to estimate total ETA.
Method: Haversine on WGS84 (mean radius 3440 nm). For routing through canals or other waypoints, add the canal entry and exit ports as legs (e.g. EGSUZ + EGPSE for Suez). See single-leg distance calculator, passage planning reference.