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A high-level study overview of the main international maritime conventions and codes a deck officer meets, including SOLAS, MARPOL and STCW, and how Maritime Master OOW gathers plain summaries for revision.

Stability can feel abstract at first. This plain-language study guide introduces centre of gravity, buoyancy, GM, list and trim as concepts, and shows where the Maritime Master apps let you practise once your course covers the sums.

A calm, conceptual look at squat and under-keel clearance for anyone studying navigation in shallow and confined waters, with notes on how CalcDeck and the free Skipper app support your revision.

A conceptual study guide to the sextant, how a celestial sight works, and how Maritime Master CalcDeck and OOW can support your revision.

A clear, conceptual study guide to chart datum and tidal reference levels. Learn what charted depths are measured from, what tidal height really means, and why the datum matters when you revise tides and under-keel clearance.

A calm, conceptual look at the two ways a radar picture can be arranged, relative motion and true motion, why students learn to move between them, and how to practise both in a safe, fully simulated study app.

Reduced visibility is treated as a special case in the rules of the road. This is a conceptual look at the topic, and at how COLREGs study and radar study fit together for revision.

A gentle, conceptual introduction to high and low pressure, the fronts within a depression, and the Coriolis effect, with a look at how the free Maritime Master Skipper app supports shorebased weather study.

Sound and fog signals are a rewarding part of studying the COLREGs. This conceptual guide explains what the signals are about and how the Maritime Master COLREGs and OOW apps can support your revision.

A gentle, conceptual introduction to the cloud families, from high wispy cloud to towering heaps, and how the free Maritime Master and Skipper apps cover cloud types and meteorology for revision.

A conceptual study guide to the give-way vessel and the stand-on vessel in the rules of the road, and how the Maritime Master COLREGs app presents the rules in plain English with scenario diagrams for revision.

A gentle, conceptual guide to the units used at sea, why the nautical mile and the knot suit navigation, and how CalcDeck and Maritime Master help beginners practise the ideas. For study only.

A friendly introduction to the parts of a ship and the basic words used aboard, from bow and stern to port and starboard, with a look at how the free Maritime Master app helps you study them.

A beginner-friendly, conceptual introduction to latitude and longitude, the grid of parallels and meridians, and how two measurements pin down a position on the globe. Includes how the free Maritime Master and Skipper apps support wider navigation study.

A friendly, conceptual introduction to the compass, the cardinal and intercardinal points, directions in degrees, and the idea of a relative bearing, with two free apps to help you study.

A conceptual and historical look at the Global Maritime Distress and Safety System, and how Maritime Master OOW includes GMDSS as background study material. This is study reading only, not emergency guidance.

A gentle, conceptual introduction to ECDIS, the Electronic Chart Display and Information System, and how Maritime Master OOW supports your study and revision.

AIS lets vessels share their identity, position and movement so that others can build a fuller picture of nearby traffic. Here is a conceptual guide to the idea, and how the OOW and Radar apps can support your revision.

A conceptual study guide to two classic ways of crossing the ocean: the steady rhumb line and the shorter great circle. Understand why the shortest track is rarely a straight line on the chart, and how to revise the ideas behind it.

Meet Maritime Master CalcDeck, a large library of maritime calculators in one app that shows the method behind every result, from the bridge to the engine room, cargo office, and cockpit.