Radar systems are fitted on all commercial vessels, and are widely used in the leisure maritime sector as well as vessel traffic services (VTS). They are frequently used in conjunction with an Automatic Target Tracking Device, traditionally known as the ARPA (Automatic Radar Plotting Aid). This fully revised new edition covers the complete radar/ARPA installation and serves as the most comprehensive and up-to-date reference on equipment and techniques for radar observers using older and newer systems alike. Suitable for use both as a professional reference and as a training text, the book covers all aspects of radar, ARPA and integrated bridge systems technology (including AIS, ECDIS and GNSS), and their role in shipboard operations. It is a valuable resource for larger vessels and also covers the needs of leisure and amateur sailors for whom this technology is now accessible.