This manual/workbook, both authors of which have been members of the Collision Avoidance Radar Department of the Maritime Institute of Technology and Graduate Studies, provides the means for an operator to develop an "at a glance" capacity on a stabilized relative motion radar. Once the system of "situation recognition" has been mastered, a multiplicity of targets can be handled safely and surely, and collision avoidance becomes quite simple. The real time method of plotting equips the deck officer to pass the Coast Guard's radar observer test.