Glossary
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TermDefinition
- General Nautical Terminology, Navigation Horizontal Dilution of Precision (HDOP)
Used in satellite navigation and positioning systems to quantify the accuracy of horizontal position measurements. It is a unitless factor that...
More Details - General Nautical Terminology, Safety Horseshoe Lifebuoy
A U-shaped flotation device designed to be thrown to a person overboard to provide buoyancy and aid in rescue.
The horseshoe lifebuoy, also...
More Details - Phonetic Alphabet, Signals & Communication Hotel
Pronounced: hoh-TELL
The term for the letter H in the NATO Phonetic Alphabet.
- General Nautical Terminology HoundsAttachments of stays to masts.
- General Nautical Terminology House flagAny personal flag or club flag flown from starboard spreaders or flagstaff.
- General Nautical Terminology Hull
The watertight body or shell of a boat or ship, excluding the deck, rigging, and other superstructures.
The hull is the fundamental structure...
More Details - General Nautical Terminology Hull SpeedThe maximum efficient speed of a displacement-hulled vessel.
- General Nautical Terminology, Weather (Meteorology) Hurricane Force
Beaufort Scale - Force 12 (Hurricane Force 12)
Hurricane-force is a term used to describe wind speeds equal to or greater than 64 knots (74...
More Details - General Nautical Terminology Hydrofoil
A lifting surface or structure mounted beneath a vessel's hull that, when moving through water, generates lift to raise the hull above the...
More Details - General Nautical Terminology HydrographyThe science of surveying the waters of the earth and adjacent land area, and publishing the results in charts, pilots, etc, for example Admiralty... More Details
- General Nautical Terminology IALA
The International Association of Lighthouse Authorities (IALA) is an international organisation that aims to promote safe, efficient, and...
More Details - General Nautical Terminology ICC
An official document that certifies a person's ability to operate a pleasure craft in countries that recognise it.
The International...
More Details - Flag / Pennant, Signals & Communication Code Flag India (I)
The International Maritime Signal Flag India.
Meaning
I am altering course to port.
- Flag / Pennant, General Nautical Terminology, Signals & Communication ICS
A system of flags, codes, and symbols used by ships to communicate essential messages and ensure safety at sea, regardless of language...
More Details - Did you know?, General Nautical Terminology, Navigation IDL
An imaginary longitudinal line located at approximately 180 degrees longitude serving as the demarcation where the calendar date changes by one...
More Details - General Nautical Terminology, Navigation IHO
An intergovernmental organisation dedicated to ensuring the uniformity and standardisation of hydrographic and nautical charting practices...
More Details - 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.
- Organisation IMO
A specialised agency of the United Nations headquartered in London and responsible for regulating shipping, the IMO has 175 Member States.
The...
More Details - General Nautical Terminology Impeller
An impeller is a rotating component within a pump or compressor that is used to impart motion to a fluid. It typically consists of blades or...
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