This is a very brief and concise overview of Radar in the hope that it will give you an overview but also show you the benefits of radar. If you have radar onboard your boat or intend to use it on another please consider taking an RYA Radar Course (1 day) and allow plenty of time to familiarise yourself with the set you will be using.
RAdio Detection and Ranging
The ability to see land masses and objects, other vessels (with radar reflectors) therefore aiding you in safe navigation.
What affects radar?
RYA Note: 'If practicable' means if it is possible to use a radar reflector on your boat then you should use one (i.e. if you have an A-Frame or similar). You should fit the largest radar reflector in terms of Radar Cross Section (RCS) that you can. Whatever size your boat is, you should fit the reflector according to the manufacturer's instructions and as high as possible for maximum detection range.
See MGN 599 for more information at: https://www.gov.uk/government/publications/mgn-599-m-pleasure-vessels-regulations-and-exemptions-guidance-and-best-practice-advice
You can adjust the diameter of the VRM and position of the EBL which will move the intersection point between them.
Determining risk of collision using radar can be done via: