Shortest sea route between any two points on Earth. TypeScript library with the 2025 Eurostat maritime network, canal/strait restrictions (Suez, Panama, Bab-el-Mandeb…), vessel-draft gating, K-shortest alternatives, multi-leg waypoints, and ETA from speed.

Calculator for nautical calculations

Get distance between two points in kilometers or nautical miles

gps-latlon is a small npm module that calculates the distance between two latitude and longitude coordinates in kilometers, meters, miles, yards, feet and nautical miles, from decimal degrees (GPS coordinates) using the Harvesine formula.

A simply program to get practise with the nautical quizzes