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Build a signal-recognition round

Choose alphabet flags, numeral pennants, or a mixed challenge from the 36-signal identity bank.

Keep the seed to replay the same questions and option order.
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Signal-family performance

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Answer ledger

Question ID Prompt Topic Your answer Correct answer Outcome Explanation Source Copy
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Semaphore Signals Quiz Practice sender-oriented A-Z semaphore recognition with reproducible rounds, pose-specific feedback, and focused replay of missed letters.
Morse Code Quiz Practice visual International Morse letters and digits in seeded rounds with immediate corrections, pattern totals, and missed-symbol replay.
Road Signs Quiz Practice 25 common US MUTCD regulatory and warning signs with repeatable rounds, immediate feedback, and focused review of misses.
Country Flags Quiz Practice 194 country flags in seeded world, regional, ASEAN, EU, or Commonwealth rounds with flexible feedback and missed-flag review.

Maritime signal flags make letters and figures visible at a distance when speech is impractical or a shared visual code is safer. The International Code of Signals (ICS) assigns a distinctive design to each of the 26 alphabet letters and a tapered pennant to each digit from 0 to 9.

Identity is only the first part of reading a hoist. An alphabet flag can stand for its letter inside a longer group, and some single-letter signals also carry complete operational meanings. Numeral pennants contribute figures to a message. Position, accompanying flags, and the governing procedure determine how the full signal should be interpreted.

The spoken labels use standardized spellings such as Alfa, Bravo, Juliett, and X-ray. Numerals have paired words including Nadazero, Unaone, Bissotwo, and Terrathree. Learning the label with the design helps connect visual recognition to the vocabulary used when signals are read aloud.

SkillWhat it answersWhat it does not prove
Flag identityWhich letter or numeral is shown?The meaning of a complete hoist
Code lookupWhat message is assigned to a signal group?That the signal fits the current situation
Operational useHow should the signal be displayed, answered, and acted on?Nothing beyond the applicable procedure and context

Visual quizzes can strengthen the first skill, especially when similar colors or geometric divisions are compared deliberately. They do not replace the current code book, training in flaghoist procedure, or observation of the whole signal. Correctly naming one flag must never be treated as a complete operational interpretation.

How to Use This Tool:

Choose a signal family before deciding how broad the round should be.

  1. Select a Signal set. Practise ICS letter flags, numeral pennants, or the combined 36-signal bank.
  2. Choose the Question count. A full-bank round presents every signal in that set once; shorter rounds draw a seeded subset without replacement.
  3. Preserve the Replay seed when comparison matters. The same set, count, and seed reproduce both the prompt order and answer order.
  4. Identify the displayed flag or pennant. Choose among four labels, then review the correct name before advancing.
  5. Study misses at completion. Compare the selected and correct labels, retry missed signals, repeat the same challenge, or start a new flag round.
Flag artwork is loaded from a public media service. If an image is unavailable, the prompt is blocked and not scored; use the recovery action instead of answering without the visual.

Interpreting Results:

Use the answer ledger to identify specific confusions, then compare those flags by color placement, division, and shape. The family chart separates letter and numeral performance when both appear, but a small seeded round may not sample each family evenly.

A full 36-signal round gives complete coverage of the bank used here. Even a perfect result measures visual identity only. It does not test substitute flags, the answering pennant, single-letter meanings, multi-flag code groups, signaling procedure, or decisions made on the water.

Technical Details:

The recognition bank follows the alphabet flags and numeral pennants listed in the United States edition of International Code of Signals, Publication 102, revised in 2020. The bank is complete for those 36 identities but deliberately excludes substitutes, the answering pennant, and operational message meanings.

Lookup Core:

The exact answer labels are grouped below for quick comparison. The distinctive spelling is part of the answer identity.

FamilyExact labels
Letters A to MAlfa, Bravo, Charlie, Delta, Echo, Foxtrot, Golf, Hotel, India, Juliett, Kilo, Lima, Mike
Letters N to ZNovember, Oscar, Papa, Quebec, Romeo, Sierra, Tango, Uniform, Victor, Whiskey, X-ray, Yankee, Zulu
Numerals 0 to 9Nadazero, Unaone, Bissotwo, Terrathree, Kartefour, Pantafive, Soxisix, Setteseven, Oktoeight, Novenine

Formula Core:

Each correct identification earns one point. Accuracy compares correct identifications with the full number of questions in the current attempt.

C = ∑i=1Nci A = 100×CN

N is the selected round length, ci is 1 for a correct identification and 0 otherwise, C is the point score, and A is accuracy. The canonical percentage retains numeric precision; the visible percentage label rounds to the nearest whole percent. Eight correct answers out of ten give 8 points and 80%.

Mechanism Core:

Signal setPoolAllowed question counts
ICS Letter Flags265, 10, 15, 20, 26
ICS Numeral Pennants105, 10
Letters + Numerals3610, 15, 20, 30, 36

Selection is seeded and without replacement. Each question includes the correct identity plus three distinct distractors drawn from the same signal pool. Same-seed replay reproduces the challenge; a new seed changes selection or ordering; missed replay begins a separate attempt containing only the signals answered incorrectly.

References: