Marine navigation calculators for sailors, navigators and GPS professionals.
Calculate distances, bearings, coordinate conversions, cross track error, great circle and rhumb line routes with the same navigation engine used across Watch & Navy products. Fast, accurate, privacy friendly, and available in multiple languages.
Navigation tools
- Speed Converter
Convert between knots, mph, km/h, m/s, and ft/s.
- Coordinate Converter
Convert GPS coordinates between decimal degrees and DMS.
- Distance Calculator
Calculate the distance between two GPS coordinates.
- Bearing Calculator
Calculate the initial bearing between two GPS coordinates.
- Cross Track Error Calculator
Calculate cross track error (XTE) from a vessel position to a planned track between two waypoints.
- Travel Time CalculatorSoon
Calculate travel duration and estimated arrival time from distance and speed.
For AI agents and integrations
From the Watch & Navy blog
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The Evolution of Sailing Technology: From Sextants to Smartphones
Sailing has always been an endeavour rooted in innovation. The tools that carried ships across oceans also carried food and trade to every shore, making navigation a foundation of global life. Each advance throughout history, from stars to satellites, reflects humanity’s ingenuity and adaptability. In the days of wooden ships and hand-drawn charts, sailors depended […]
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Naval Seamanship: What Civilians Can Learn from Naval Crews About Sailing
Naval life revolves around mastery, discipline, and survival. Sailors must make split-second decisions, adapt to chaos, and execute with calm under pressure. For centuries, naval forces have refined their approach to the sea, and their learnings have been passed down to the present generation. And while most civilian sailors won’t face combat, there’s a deep […]
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Winter Weather Sailing: Handling Snow, Ice, and Strong Winds
Winter sailing offers a unique combination of beauty and challenge. Snow-covered coastlines and icy waters create an unforgettable experience, but they also demand heightened caution and preparation. Slippery decks, strong winds, and reduced visibility are just some of the hazards sailors face during colder months. Whether you’re a seasoned mariner or new to winter conditions, […]
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Top Safety Tips for Boating in the UK and Overseas
Boating in the UK during the summer is a fantastic way to enjoy the beauty of the coastline, lakes, and rivers. The scenic views, fresh air, and sense of adventure that come with being on the water are exhilarating. Prioritising safety is crucial to ensure your boating adventures are safe as well as enjoyable. With […]
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