Master vs Nautical Flags Helper

Master-Nav is a progressive COLREGS learning system developed by a Master Mariner. The COLREGS are notoriously difficult to learn and retain — Master-Nav makes it significantly easier through an interactive system built around how your brain actually works. Instead of guessing through random question banks, Master-Nav guides you step by step through every rule from start to finish. Wrong answers are revisited until the rules stick — properly. Complex regulations are broken down into learnable chunks — bite-sized sections supported by mnemonics, memory aids and interactive visuals designed around how the brain actually retains information. Every incorrect answer is shown graphically alongside the correct one — immediately clear, no confusion. And with a single tap, the relevant COLREGS rule is accessible from any question at any time. Master-Nav covers COLREGS Parts A to D — General, Steering & Sailing, Lights & Shapes and Sound & Light Signals — plus Annex IV Distress Signals. Over 1000 questions in multiple formats, with a dedicated Practice Section that tracks right, wrong and unanswered so you always know where to focus. COLREGS — the easy way.

Learn the international signal flags, Morse code and flag semaphore in one app. Study with clear pictures and flashcards, then test yourself with quizzes at three levels. Made for sailors, boaters, sea cadets, maritime students and anyone curious about how ships talk to each other. SIGNAL FLAGS, A TO Z • All 26 letter flags, from Alfa to Zulu, with the phonetic name of each one • The meaning of every flag when flown alone, such as A: "I have a diver down; keep well clear at slow speed" and O: "Man overboard" • Ten numeral pennants with their code words, such as Nadazero and Unaone • The four substitute flags and the answering pennant, with how each one is used MULTIPLE-FLAG SIGNALS Browse more than 1,800 flag signals based on the International Code of Signals (Pub. 102, 2020 edition). • General two-letter signals, such as NC "I am in distress and require immediate assistance" • Medical three-letter signals that start with M, such as MAA "I request urgent medical advice" • Worked examples of numbers: courses, bearings, dates, times, latitude, longitude, distance and speed • Step-by-step examples of how substitute flags repeat a flag in the same hoist • Tables of complements that add detail to a signal, like the kind of assistance or the state of the sea • Search by code or by word, and switch to List View to see every meaning at a glance MORSE CODE • Dots and dashes for every letter and number • Tap Listen to hear how each character sounds FLAG SEMAPHORE • Arm positions for every letter and number • Special signals such as Attention, Error, Cancel, Numerals and Space STUDY YOUR WAY • Flashcard Mode: tap a card to flip it and check your answer • Shuffle the cards or sort them from A to Z • Zoom in to see the details of each flag • Short explanations of each topic, with links to read more on Wikipedia QUIZZES AT THREE LEVELS • Easy (10 questions), Medium (20 questions) and Hard (30 questions) • Match a picture to its name, or a name to its picture • Medium and Hard also ask what each signal means • Hard picks wrong answers that look like the right one, so you learn the differences between similar flags and Morse patterns • Use a hint to remove two wrong answers • Build a custom quiz from letters, numbers, Morse code and semaphore • Turn on "Next question automatically" for faster practice • See your correct, incorrect and skipped answers and your time after each quiz TRACK YOUR PROGRESS • Daily goals for questions answered and study time • Charts of correct and incorrect answers by day, week, month and year • Total quizzes, average accuracy, time spent and best score BUILT FOR IPHONE AND IPAD • Light and Dark Mode, or follow your system setting • Layouts made for iPhone and iPad • Available in English, Spanish, French and Russian Whether you are preparing for a sailing course, refreshing your seamanship skills or teaching a youth group, Nautical Flags Helper keeps the flags, Morse code and semaphore in your pocket. The app is free to use and shows ads. An optional one-time in-app purchase removes all ads. There is no subscription. This app is a study aid. It is not an official publication and is not intended for navigation.