Ridderkerk port and ships, live

The Index rates Rotterdam a large river harbour built around basins. It lists yards for major repairs and a dry dock there. Its entrance channel is at least 11 m deep. Rotterdam, 8 km away, is one of the major ports the map marks.

• Dordrecht7 km from the centreMedium-sized harbour · counted on the page for Dordrecht
• Rotterdam9 km from the centreLarge harbour · counted on the page for Rotterdam

In 24 hours of AIS recorded Oct 12 – 19, the map heard 1,787 different ships within 10 km of Rotterdam, one of the best-covered harbours on the map.

• NGA’s World Port Index rates a harbour by its area, facilities and wharf space when it was last surveyed, not by its traffic, so a busy terminal can be rated small. Where it doesn’t know about a facility it says so, and only what it marks as there is listed here.
• AIS is heard by receivers on shore, so coverage follows where they are: ships far out at sea, or off coasts without one, don’t show. Warships and some others switch it off, and a ship’s type and destination are typed in by its crew.
• Harbours from NGA’s World Port Index (Pub. 150), downloaded on Oct 19, 2026. The major ports and chokepoints are the map’s own reference list.

How the layers work, where their data comes from and what they can’t tell you: Live ship tracker, Shipping chokepoints