Signalling & Communication
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TermDefinition
- 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.
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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.

