Signalling & Communication
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TermDefinition
- Flag / Pennant, Signals & Communication First Substitute (ICS Flag)

Substitute or repeater flags allow messages with duplicate characters to be signalled without requiring multiple sets of flags.
- Did you know?, Flag Semaphore, Signals & Communication Flag Semaphore Signals
A system for conveying information at a distance through visual signals using hand-held flags.
The position of the flags encodes the...
More Details - Flag Semaphore, Signals & Communication Letter F (Flag Semaphore)

This shape represents the Letter F (Flag Semaphore) and the Number 6 (Flag Semaphore).
- Morse Code, Signals & Communication Letter F (Morse Code)
International Morse Code sequence representing the letter F.
- Phonetic Alphabet, Signals & Communication Foxtrot
Pronounced: FOKS-trot
The term for the letter F in the NATO Phonetic Alphabet.
- General Nautical Terminology, Signals & Communication Frequency Modulation (FM)
A method of encoding information in a carrier wave by varying its frequency, commonly used in marine radio communications.
Frequency...
More Details - Flag / Pennant, Signals & Communication Code Flag Golf (G)

The International Maritime Signal Flag Golf.
Meaning
I require a pilot.
More Details
By fishing vessels: I am hauling nets.
If appended by a Numeral... - Flag Semaphore, Signals & Communication Letter G (Flag Semaphore)

This shape represents the Letter G (Flag Semaphore) and the Number 7 (Flag Semaphore).
- Morse Code, Signals & Communication Letter G (Morse Code)
International Morse Code sequence representing the letter G.
- Signals & Communication Global Maritime Distress and Safety System Sea Areas
A map of the UK indicating the 3 sea areas around the coast and the coast of nearby European countries. White pointers indicate Medium Frequency...
More Details - Phonetic Alphabet, Signals & Communication Golf
Pronounced: GOLF
The term for the letter G in the NATO Phonetic Alphabet.
- Flag / Pennant, Signals & Communication Code Flag Hotel (H)

The International Maritime Signal Flag Hotel.
Meaning
I have a pilot on board.
- General Nautical Terminology, Signals & Communication High Frequency (HF)
The radio frequency range between 3 and 30 megahertz (MHz), commonly used for long-range marine communications via skywave propagation.
High...
More Details - Flag Semaphore, Signals & Communication Letter H (Flag Semaphore)

This shape represents the Letter H (Flag Semaphore) and the Number 8 (Flag Semaphore).
- Morse Code, Signals & Communication Letter H (Morse Code)
International Morse Code sequence representing the letter H.
- Phonetic Alphabet, Signals & Communication Hotel
Pronounced: hoh-TELL
The term for the letter H in the NATO Phonetic Alphabet.
- Flag / Pennant, Signals & Communication Code Flag India (I)

The International Maritime Signal Flag India.
Meaning
- Flag Semaphore, Signals & Communication Letter I (Flag Semaphore)

This shape represents the Letter I (Flag Semaphore) and the Number 9 (Flag Semaphore).
- Morse Code, Signals & Communication Letter I (Morse Code)
International Morse Code sequence representing the letter I.
- Phonetic Alphabet, Signals & Communication India
Pronounced: IN-dee-ah
The term for the letter I in the NATO Phonetic Alphabet.

