Grade 12 – Nautical Science

September 9, 2020

Use of marine radar

Most marine radars operate in the 10 GHz (3 cm wavelength) and 3 GHz (10 cm wavelength) frequency bands. Although a bit outdated, these bands are still referred to as X band (10GHz) and S band (3 GHz). Radars operating in the 10 GHz band (3 cm wavelength) provide much […]
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September 9, 2020

Typical radar system

Although radars have become more sophisticated with the advances in technology, it is intended to give a very basic description of the components and workings of a typical radar system. The block diagram that follows is a very simplified version of a radar and must be seen as such. The […]
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September 10, 2020

Characteristics of a radar system

What is the nature of the transmission and how does it affect the performance of the radar? There are a number of parameters which we can look at: Power Output. Obviously, the power output of the different radars will differ from one another, but to give one an idea of […]
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September 10, 2020

Possible shortcomings

Radar is referred to as an aid to navigation because it has certain shortcomings that could result in a collision or grounding if it is relied on exclusively. These shortcomings are: Size of target. Radio waves reflect very well from large objects but sometimes small objects are missed because of […]
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September 17, 2020

Coastal navigation techniques

How do we utilise radar for normal navigation purposes under normal conditions of visibility? There are four basic ways: Fix by radar range and visual bearing. This is used when there are few recognisable navigation marks ashore for visual bearings. Fix using radar ranges as position arcs. This is the […]
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