Glossary Archive

The flag represents the numerical value of eight.

The flag represents the numerical value of nine.

A triangular flag used in maritime signalling to represent numerical digits, typically in conjunction with other signal flags. A numeral pennant is a key component of the International Code of Signals, a system used by ships to communicate essential information when visual signalling is required. These pennants are triangular in shape and are numbered from...

This flag semaphore signal indicates a change from letters to numbers (Numbers Follow), indicating that the signaller will be using the numeric definition of signals A to I (1 to 9) and K (0). The signaller will use the Letter J (Flag Semaphore) when switching back to the default letter sypher.

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 regularly visible but intermittently obscured at regular intervals. The light is on for longer periods than off, creating a distinctive pattern for mariners to recognise and use...

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 regularly visible but intermittently obscured at regular intervals. The light is on for longer periods than off, creating a distinctive pattern for mariners to recognise and use...

The Ocean Data Acquisition System (ODAS) is a system used to collect, process, and transmit various types of oceanographic data. This system typically includes a network of sensors, instruments, and data loggers deployed in the ocean to measure parameters such as temperature, salinity, currents, waves, and other environmental conditions. The data collected by the ODAS...

The International Maritime Signal Flag Oscar. Meaning Man overboard. (Often attached to the Danbuoy pole on boats.)The semaphore flag.

The Ocean Data Acquisition System (ODAS) is a system used to collect, process, and transmit various types of oceanographic data. This system typically includes a network of sensors, instruments, and data loggers deployed in the ocean to measure parameters such as temperature, salinity, currents, waves, and other environmental conditions. The data collected by the ODAS...

The designated officer responsible for the safe navigation and operation of a vessel during their assigned watch period.  The Officer of the Watch (OOW) is a key role on a vessel, ensuring the ship's safe passage and adherence to regulations while on duty. The OOW is responsible for maintaining a proper lookout, monitoring navigational equipment,...