Appendix B: Radar
141
Appendix B: Radar
Introduction
This appendix describes the basics of radar and things that can affect the radar
picture.
What is radar?
Radio Detection And Ranging (RADAR) is something that is in use all around us,
although it is normally invisible. One of the most common uses of radar at sea is to
detect the presence of objects, known as ‘targets’ at a distance, and if they are
moving, detect their speed.
Until you are familiar with interpreting the radar display, every opportunity should
be taken to compare the radar screen patterns with visual targets, such as other
boats, buoys and coastal structures. You should practice harbor and coastal
navigation during daylight hours and in clear weather conditions
Scanner
The radar scanner unit illuminates targets with microwave energy and then
collects the returns from those targets. The scanner includes a sensitive low-noise
front end receiver, and a variety of clutter attenuation controls to maintain target
resolution.
The scanner is adjusted and operated from the display screen. It can be switched
between transmit and stand-by modes. It also has a power-saving timed transmit
mode which pauses between bursts of transmissions.
Maximum radar range
Maximum radar range is essentially line of sight, so is limited by the height of the
scanner and the height of the target as illustrated below:
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