Master vs ForeignSail

Master-Nav: COLREGS IALA Tests is a free practice app developed by a Master Mariner with 30 years of seagoing experience. Test your knowledge of the USCG Navigation Rules and IALA Maritime Buoyage System — the regulations every mariner needs to know. A straightforward way to find out where you stand, identify gaps in your knowledge and track your progress over time. Master COLREGS & IALA — the easy way.

ForeignSail is the ultimate nautical terminology companion for sailors, boaters, and maritime professionals navigating international waters. Whether you're docking in a French marina, buying equipment in Spain, or sailing with an Italian crew, ForeignSail helps you communicate with confidence. TRANSLATE Search over 1,000 nautical terms instantly across English, French, Spanish, and Italian. Each term includes definitions in all four languages so you always understand the full meaning, not just the word. IDENTIFY Point your camera at any piece of boat equipment and our AI will identify it and find the matching nautical term in all four languages. Works with cleats, winches, blocks, lines, and hundreds of other marine items. CONVERT Built-in nautical unit converter for the measurements sailors use every day: • Knots, km/h, mph, m/s • Nautical miles, kilometers, meters, feet, fathoms, inches • Kilograms, pounds, long tons • Liters, US gallons, imperial gallons • Pressure: hPa, inches Hg • Temperature: Celsius, Fahrenheit OFFLINE ACCESS Premium subscribers can access the full term database offline — perfect when you're at sea without a signal. GO PREMIUM Upgrade to remove ads and unlock full offline access. One-time lifetime purchase available. Built by sailors, for sailors.