Glossary
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TermDefinition
- General Nautical Terminology HeelThe angle a vessel leans over in the wind.
- General Nautical Terminology, Navigation Height of Light
The vertical distance from the water's surface at Mean High Water Springs to the focal plane of a lighthouse's light source.
Height of Light...
More Details - General Nautical Terminology, Navigation Height of Tide
The vertical distance between the water's surface at any given time and the established chart datum, typically the lowest astronomical...
More Details - General Nautical Terminology HelmA ship's steering mechanism. A person who steers a ship.
- General Nautical Terminology HelmsmanThe member of the crew who steers the vessel
- Courses, RYA Helmsman's PracticalThe RYA Helmsman’s Practical course is designed to build confidence and competence in handling motorboats. Participants learn essential skills... More Details
- General Nautical Terminology, Signals & Communication HF
The radio frequency range between 3 and 30 megahertz (MHz), commonly used for long-range marine communications via skywave propagation.
High...
More Details - General Nautical Terminology, Navigation Highest Astronomical Tide (HAT)
The highest level of sea water that can be predicted to occur under average meteorological conditions and under any combination of astronomical...
More Details - 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 - Organisation His Majesty's Nautical Almanac Office (HMNAO)
The UK government agency responsible for producing astronomical and navigational data for maritime and military use.
His Majesty's Nautical...
More Details - General Nautical Terminology, Knot Hitch
A knot that attaches a rope to an object, such as a post, ring, or other rope.
A hitch is a versatile and essential knot where securing a rope...
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.
- Organisation HMCG
The organisation responsible for search and rescue operations in UK waters.
His Majesty's Coastguard (HMCG) is a section of...
More Details - Organisation HMNAO
The UK government agency responsible for producing astronomical and navigational data for maritime and military use.
His Majesty's Nautical...
More Details - General Nautical Terminology Hoist
To raise an object vertically, commonly a sail or flag, using a halyard.
It typically uses a system of ropes, cables, pulleys, and sometimes a...
More Details - General Nautical Terminology Holding Tank
A sealed onboard container designed to temporarily store wastewater, such as sewage or greywater, until it can be properly discharged at a...
More Details - 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 Horseshoe lifebuoyA horseshoe-shaped lifebuoy should be mounted where it can quickly be thrown to a ‘man’ overboard (MOB). The lifebuoy needs to be ready for action... More Details
- Phonetic Alphabet, Signals & Communication Hotel
Pronounced: hoh-TELL
The term for the letter H in the NATO Phonetic Alphabet.