We have consolidated the first three videos for Grade 10 Nautical Science on this page for ease of access. They also appear on the pages associated with each topic and are designed to give you a graphical and ‘classroom like’ overview of each topic, providing context and meaning to the course syllabus that follows on…
We have consolidated all the videos for Grade 10 on this page for ease of access. They also appear on the pages associated with each topic and are designed to give you a graphical and ‘classroom like’ overview of each topic, providing context and meaning to the course syllabus that follows on that particular page.
Vessel identities. Vessels identify one another either by their name or international call sign. The name is obviously given to the ship when it is launched. The call sign is allocated by the department issuing the vessel’s radio licence/certificate, usually by the country in which the ship is registered. A call sign is a sequence…
Radio communications are the the most commonly used means of communication today. It is the easiest to use and the most versatile. It requires no particular skill and it has tremendous range. In addition, it supports a multitude of types of communication, ie telephony (voice), telegraphy (morse), facsimile (reproduction of original documents or graphics at…
Pyrotechnics. By pyrotechnics is meant the use of flares of different colours as a means of conveying certain meanings. For example, if a vessel fires a red flare it means internationally that it is in trouble and requires assistance. The use of various coloured flares is mainly used by the military. Its use is very…
Semaphore. Semaphore is a means of signalling employing two hand held flags held in various positions relative to the communicator’s body. The flags used are the same, ie flag OSCAR (flag diagonally split by the colours red and yellow. This form of communicating is virtually obsolete today but it may still be employed in various…
The use of signal flags goes back a long way and was made famous by Nelson shortly before the battle of Trafalgar. Although not so extensively used today, flags as a limited means of communication has managed to survive. The merchant navy make use of a total of 40 individual flags, 26 alphabetical flags, 10…
Introduction. Communication plays a very important part in modern society. We have advanced from the days of the old land-line based telephone and postal (snail) mail to mobile phones and e-mail. Technology has given us the ability to communicate with each other instantly and anywhere in the world. It has developed to such an extent…
Air masses are large areas of air having the same characteristics throughout. They may be either warm or cold, depending on whether their source is polar or tropical. They are also classified as either maritime or continental. When two different air masses meet they form a boundary which is known as a front. Fronts are…
Atmospheric pressure and temperature are mainly responsible for our weather systems. Atmospheric pressure is the pressure that the air exerts on the surface of the earth and everything on it. It changes with altitude and temperature. The air pressure in Johannesburg is less than that at the coast. When the air is heated it expands,…
