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
14
No login
14
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
Practice 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 Moon phase, spring and neap range, a local harbour tide curve, and the rule of twelfths fit together without treating them as one clock.
Navigation marks
IALA Region A buoyage quiz
Practise Region A lateral marks, plus 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 practice chart symbols, soundings, contours, hazards, buoyage, and route choice.
Nautical fundamentals
Compass workbench
Practice 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 maths
Distance, speed and time
Calculate any of the three navigation quantities, see the working, and complete six practice problems.
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.