Mariner Tools
Precise, free marine and GPS calculators for sailors, navigators, and boaters. Speed conversions, coordinate transformations, distance and bearing calculations — built to the same standard as the Mariner GPS Dashboard app.
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.
- Travel Time Calculator Soon
Calculate travel duration and estimated arrival time from distance and speed.
From the Watch & Navy blog
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Best Places to Sail in the UK 2026: England, Scotland, and Wales
Sailing in the United Kingdom offers a distinctive blend of historical significance and natural beauty. With its rich maritime heritage and a variety of sailing destinations, the UK provides memorable experiences for both novice and seasoned sailors. From tranquil inland waters to rugged coastal landscapes, there is a sailing spot for everyone. This guide will […]
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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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