Radar equipment is available from various brands, such as Simrad, Koden and Furono. Nowadays a radar system is indispensable and is virtually mandatory in commercial shipping. There are two standard radars:

The X-band radar operates on the high frequency of 10 GHz. Due to this high frequency, the radar has a higher resolution, which provides a better representation.
The S-band radar operates at a frequency of 3 GHz. Due to this lower frequency, the resolution is lower, which means a less good display. However, the image is often less affected by the different weather conditions.

In addition to the information on your radar screen, there is much more information to be found. For example, because the radar is linked to the GPS, AIS, an autopilot or electronic compasses.