Signalling & Communication
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TermDefinition
- Phonetic Alphabet, Signals & Communication Mike
Pronounced: MIKE
The term for the letter M in the NATO Phonetic Alphabet.
- Flag Semaphore, Signals & Communication Letter M (Flag Semaphore)

Flag semaphore indicating the letter M.
- Morse Code, Signals & Communication Letter M (Morse Code)
International Morse Code sequence representing the letter M.
- Flag / Pennant, Signals & Communication Code Flag November (N)

The International Maritime Signal Flag November.
Meaning
Negative.
- Flag Semaphore, Signals & Communication Letter N (Flag Semaphore)

Flag semaphore indicating the letter N.
- Morse Code, Signals & Communication Letter N (Morse Code)
International Morse Code sequence representing the letter N.
- Phonetic Alphabet, Signals & Communication November
Pronounced: no-VEM-ber
The term for the letter N in the NATO Phonetic Alphabet.
- Flag / Pennant, Signals & Communication Numeral 4 (Flag Pennant)

The flag represents the numerical value of four.
- Flag / Pennant, Signals & Communication Numeral 5 (Flag Pennant)

The flag represents the numerical value of five.
- Flag / Pennant, Signals & Communication Numeral 6 (Flag Pennant)

The flag represents the numerical value of six.
- Flag / Pennant, Signals & Communication Numeral 7 (Flag Pennant)

The flag represents the numerical value of seven.
- Flag / Pennant, Signals & Communication Numeral 8 (Flag Pennant)

The flag represents the numerical value of eight.
- Flag / Pennant, Signals & Communication Numeral 9 (Flag Pennant)

The flag represents the numerical value of nine.
- Flag / Pennant, General Nautical Terminology, Signals & Communication Numeral Pennant
A triangular flag used in maritime signalling to represent numerical digits, typically in conjunction with other signal flags.
A numeral...
More Details - Flag Semaphore, Signals & Communication Numerals-Numbers Follow (Flag Semaphore)

This flag semaphore signal indicates a change from letters to numbers (Numbers Follow), indicating that the signaller will be using the...
More Details - Flag / Pennant, Signals & Communication Code Flag Oscar (O)

The International Maritime Signal Flag Oscar.
Meaning
Man overboard. (Often attached to the Danbuoy pole on boats.)
The semaphore flag. - Flag Semaphore, Signals & Communication Letter O (Flag Semaphore)

Flag semaphore indicating the letter O.
- Morse Code, Signals & Communication Letter O (Morse Code)
International Morse Code sequence representing the letter O.
- Phonetic Alphabet, Signals & Communication Oscar
Pronounced: OSS-cah
The term for the letter O in the NATO Phonetic Alphabet.
- General Nautical Terminology, Safety, Signals & Communication Pan Pan
An internationally recognised maritime urgency signal used in radio communications to indicate a situation that is urgent but does not pose an...
More Details - Phonetic Alphabet, Signals & Communication Papa
Pronounced: pah-pah
The term for the letter P in the NATO Phonetic Alphabet.
- Flag / Pennant, Signals & Communication Code Flag Papa (P)

The International Maritime Signal Flag Papa.
Meaning
The Blue Peter.
More Details
In harbour: All persons should report on board as the vessel is... - Phonetic Alphabet, Signals & Communication Phonetic Alphabet
The Phonetic Alphabet, also known as the International Radiotelephony Spelling Alphabet or NATO phonetic alphabet, is a standardised set of words...
More Details - Flag Semaphore, Signals & Communication Letter P (Flag Semaphore)

Flag semaphore indicating the letter P.
- Morse Code, Signals & Communication Letter P (Morse Code)
International Morse Code sequence representing the letter P.
- General Nautical Terminology, Signals & Communication Procedure Words
Standardised words or phrases used in marine radio communication to ensure clarity, reduce misunderstandings, and maintain efficient and safe...
More Details - Flag / Pennant, Signals & Communication Code Flag Quebec (Q)

The International Maritime Signal Flag Quebec.
Meaning
Quarantine Flag.
My vessel is healthy and I request free pratique. - Flag Semaphore, Signals & Communication Letter Q (Flag Semaphore)

Flag semaphore indicating the letter Q.
- Morse Code, Signals & Communication Letter Q (Morse Code)
International Morse Code sequence representing the letter Q.
- Phonetic Alphabet, Signals & Communication Quebec
Pronounced: keh-BECK
The term for the letter Q in the NATO Phonetic Alphabet.
- Flag / Pennant, Signals & Communication Code Flag Romeo (R)

The International Maritime Signal Flag Romeo.
Meaning
Distance (range) in nautical miles. Given using Numeral Pennants.
- Flag Semaphore Ready (Flag Semaphore)

The Ready (Flag Semaphore) signal shows the sender is ready to send a message. The same shape is also used for Space (Flag Semaphore) & Rest...
More Details - Flag Semaphore Ready to Recieve (Flag Semaphore)

The Ready to Recieve signal shows the sender that the recipient is ready to receive a message. This shape is displayed once the sender has...
More Details - Flag Semaphore Rest (Flag Semaphore)

When the sender is not actively sending messages, both flags are held by their side. The same shape is also used for Space (Flag Semaphore) &...
More Details - Flag Semaphore, Signals & Communication Letter R (Flag Semaphore)

Flag semaphore indicating the letter R.
- Morse Code, Signals & Communication Letter R (Morse Code)
International Morse Code sequence representing the letter R.
- Phonetic Alphabet, Signals & Communication Romeo
Pronounced: ROW-me-oh
The term for the letter R in the NATO Phonetic Alphabet.
- Flag / Pennant, Signals & Communication Code Flag Sierra (S)

The International Maritime Signal Flag Sierra.
Meaning
I am operating astern propulsion.
More Details
If appended with a Numeral Pennant, Speed... - Flag / Pennant, Signals & Communication Second Substitute (ICS Flag)

Substitute or repeater flags allow messages with duplicate characters to be signalled without requiring multiple sets of flags.
- General Nautical Terminology, Safety, Signals & Communication Sécurité
A maritime safety message broadcast over radio to convey important but non-urgent navigational or weather-related information.
Sécurité is a...
More Details - Flag Semaphore, Morse Code, Signals & Communication Semaphore
A signalling system used to convey information at a distance by means of visual signals, typically using flags or lights.
Semaphore is a...
More Details - Phonetic Alphabet, Signals & Communication Sierra
Pronounced: see-AIR-rah
The term for the letter S in the NATO Phonetic Alphabet.
- Flag Semaphore, Signals & Communication Letter S (Flag Semaphore)

Flag semaphore indicating the letter S.
- Morse Code, Signals & Communication Letter S (Morse Code)
International Morse Code sequence representing the letter S.
- General Nautical Terminology, Morse Code, Safety, Signals & Communication SOS
The universally recognised distress signal used in maritime communication to indicate an emergency requiring immediate assistance.
The German...
More Details - Flag Semaphore Space (Flag Semaphore)

This shape indicates a space, usually between words. The same shape is also used for Rest (Flag Semaphore) & Ready (Flag Semaphore).
More Details - General Nautical Terminology, Signals & Communication Standard Marine Communication Phrases (SMCP)
A set of internationally agreed-upon phrases used to ensure clear, concise, and unambiguous communication at sea, particularly between vessels...
More Details - Phonetic Alphabet, Signals & Communication Tango
Pronounced: TANG-go
The term for the letter T in the NATO Phonetic Alphabet.
- Flag / Pennant, Signals & Communication Code Flag Tango (T)

The International Maritime Signal Flag Tango.
Meaning
Keep clear of me.
More Details
Fishing boats: Keep clear of me; I am engaged in pair... - Flag / Pennant, Signals & Communication Third Substitute (ICS Flag)

Substitute or repeater flags allow messages with duplicate characters to be signalled without requiring multiple sets of flags.
- Flag Semaphore, Signals & Communication Letter T (Flag Semaphore)

Flag semaphore indicating the letter T.
- Morse Code, Signals & Communication Letter T (Morse Code)
International Morse Code sequence representing the letter T.
- Flag / Pennant, Signals & Communication Code Flag Uniform (U)

The International Maritime Signal Flag Uniform.
Meaning
You are running into danger.
- Flag Semaphore, Signals & Communication Letter U (Flag Semaphore)

Flag semaphore indicating the letter U.
- Morse Code, Signals & Communication Letter U (Morse Code)
International Morse Code sequence representing the letter U.
- Phonetic Alphabet, Signals & Communication Uniform
Pronounced: YOU-nee-form
The term for the letter U in the NATO Phonetic Alphabet.
- Flag / Pennant, Signals & Communication Code Flag Victor (V)

The International Maritime Signal Flag Victor.
Meaning
I require assistance.
More Details
If appended with a Numeral Pennant, Velocity in kilometres... - General Nautical Terminology, Signals & Communication Very High Frequency (VHF)
A range of radio frequencies from 30 MHz to 300 MHz, commonly used in marine communication for short-range, line-of-sight transmissions.
Very...
More Details - General Nautical Terminology, Safety, Signals & Communication VHF Radio
A communication device that operates on Very High Frequency (VHF) radio waves, used for ship-to-ship, ship-to-shore, and emergency maritime...
More Details - Phonetic Alphabet, Signals & Communication Victor
Pronounced: VIK-tah
The term for the letter B in the NATO Phonetic Alphabet.
- Flag Semaphore, Signals & Communication Letter V (Flag Semaphore)

Flag semaphore indicating the letter V.
- Morse Code, Signals & Communication Letter V (Morse Code)
International Morse Code sequence representing the letter V.
- Flag / Pennant, Signals & Communication Code Flag Whiskey (W)

The International Maritime Signal Flag Whiskey.
Meaning
I require medical assistance.
- Did you know?, Phonetic Alphabet, Signals & Communication Whiskey
Pronounced: WISS-key
The term for the letter W in the NATO Phonetic Alphabet.
- Flag Semaphore, Signals & Communication Letter W (Flag Semaphore)

Flag semaphore indicating the letter W.
- Morse Code, Signals & Communication Letter W (Morse Code)
International Morse Code sequence representing the letter W.
- Flag / Pennant, Signals & Communication Code Flag Xray (X)

The International Maritime Signal Flag Xray.
Meaning
Stop carrying out your intentions and watch for my signals.
- Flag Semaphore, Signals & Communication Letter X (Flag Semaphore)

Flag semaphore indicating the letter X.
- Morse Code, Signals & Communication Letter X (Morse Code)
International Morse Code sequence representing the letter X.
- Phonetic Alphabet, Signals & Communication X-Ray
Pronounced: ECKS-ray
The term for the letter X in the NATO Phonetic Alphabet.
- Phonetic Alphabet, Signals & Communication Yankee
Pronounced: YANG-kee
The term for the letter Y in the NATO Phonetic Alphabet.
- Flag / Pennant, Signals & Communication Code Flag Yankee (Y)

The International Maritime Signal Flag Yankee.
Meaning
I am dragging my anchor.
- Flag Semaphore, Signals & Communication Letter Y (Flag Semaphore)

Flag semaphore indicating the letter Y.
- Morse Code, Signals & Communication Letter Y (Morse Code)
International Morse Code sequence representing the letter Y.
- Flag / Pennant, Signals & Communication Code Flag Zulu (Z)

The International Maritime Signal Flag Zulu.
Meaning
I require a tug.
More Details
By fishing vessels near fishing grounds: I am shooting nets.
If... - Flag Semaphore, Signals & Communication Letter Z (Flag Semaphore)

Flag semaphore indicating the letter Z.
- Morse Code, Signals & Communication Letter Z (Morse Code)
International Morse Code sequence representing the letter Z.
- Phonetic Alphabet, Signals & Communication Zulu
Pronounced: ZOO-loo
The term for the letter Z in the NATO Phonetic Alphabet.

