Glossary
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TermDefinition
- Abbreviation, Light Characteristic Oc
A light with more light than dark (is on for longer than it is off).
Occulting refers to a type of navigational light in which the light is...
More Details - Abbreviation, Light Characteristic Occulting (Oc)
A light with more light than dark (is on for longer than it is off).
Occulting refers to a type of navigational light in which the light is...
More Details - General Nautical Terminology Ocean Data Acquisition System (ODAS)
The Ocean Data Acquisition System (ODAS) is a system used to collect, process, and transmit various types of oceanographic data. This system...
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. - General Nautical Terminology ODAS
The Ocean Data Acquisition System (ODAS) is a system used to collect, process, and transmit various types of oceanographic data. This system...
More Details - General Nautical Terminology Officer of the Watch (OOW)
The designated officer responsible for the safe navigation and operation of a vessel during their assigned watch period.
The Officer of the...
More Details - General Nautical Terminology Offshore
The area of the sea that is away from the coast, typically beyond the immediate inshore waters, and often associated with deeper waters and...
More Details - Courses, RYA Offshore Personal Survival (RYA/World Sailing)The Offshore Personal Survival course is an intensive program designed for sailors participating in offshore and ocean races. Participants learn... More Details
- General Nautical Terminology OilskinsWaterproof clothing worn in foul weather
- 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.
- General Nautical Terminology OnshoreWind blowing towards the land or “not at sea”.
- General Nautical Terminology, Parts of a Boat On the Port Bow
Refers to something located in the forward left quadrant of a vessel, between directly ahead and 90 degrees to the port (left) side.
"On the...
More Details - General Nautical Terminology On the Port QuarterAt an angle to the stern of your vessel, but abaft the beam, to the left
- General Nautical Terminology, Parts of a Boat On the Starboard Bow
Refers to a position or object located forward of the vessel and to the right-hand side when facing the bow (front) of the ship.
"On the...
More Details - General Nautical Terminology, Parts of a Boat On the Starboard Quarter
The area of a vessel located towards the rear (aft) on the right-hand side when facing forward.
The phrase "on the starboard quarter" is a...
More Details - General Nautical Terminology OOW
The designated officer responsible for the safe navigation and operation of a vessel during their assigned watch period.
The Officer of the...
More Details - Phonetic Alphabet, Signals & Communication Oscar
Pronounced: OSS-cah
The term for the letter O in the NATO Phonetic Alphabet.
- General Nautical Terminology, Parts of a Boat Outhaul
A line or tackle system used to adjust the tension and position of the sail's clew along the boom, affecting the sail's shape and...
More Details - General Nautical Terminology OverfallsTurbulent waters where is a sudden change in depth or where two tidal streams meet
- General Nautical Terminology Overhand loop
A loop that crosses on top of the standing part of a rope when tying a knot.

