Free tools
Free sailing and navigation tools
Interactive revision tools for boat anatomy, chart reading, tides, compass work, sextant basics, buoyage, docking, signal flags, COLREGs, radio, and navigation calculations.
Fundamentals
6
Free tools
13
No login
13
Learn the boat
Names, parts, flags, and visual recognition before the navigation work starts.
Nautical fundamentals
Boat anatomy
Learn the parts of a boat with an interactive sailing yacht and powerboat anatomy explainer for RYA theory revision.
Seamanship
Maritime signal flags
Learn International Code of Signals flags, hoists, and spelling by flags.
Boat handling
Docking simulator
Practise fenders, lines, wind, stream, prop walk, and slow alongside approaches.
Read the water
Chart datum, tide motion, tidal heights, buoyage, and marks.
Nautical fundamentals
Chart datum
Understand chart datum, charted depth, drying height, height of tide, depth of water, bridge clearance, springs, and neaps.
Nautical fundamentals
Tides in motion
Explore how tides work with a moving Earth, Moon, Sun, tide curve, spring and neap range, and rule-of-twelfths view.
Navigation marks
IALA buoyage quiz
Recognise lateral, cardinal, isolated danger, safe water, and special marks.
Tides
Tidal heights practice
Read a tidal curve and estimate height of tide between high and low water.
Navigate
Chart symbols, compass references, vectors, and celestial-navigation foundations.
Nautical fundamentals
Chart reader
Use a fictional nautical chart to practise chart symbols, soundings, contours, hazards, buoyage, and route choice.
Nautical fundamentals
Compass workbench
Practise true, magnetic, and compass bearings with variation, deviation, hand-bearing lines, and a simple chart fix.
Nautical fundamentals
Sextant simulator
See how a sextant doubles angles, align the Sun with the horizon, and work a simplified noon-sight latitude calculation.
Navigation
Course to steer practice
Apply tidal vectors, leeway, and heading corrections in navigation problems.
Rules and radio
Recognition and communication practice for COLREGs and VHF revision.