Coast artillery fire control is a complicated subject being both a science and an art. Any description will vary widely with the date, equipment and country. The term fire control evolved over the years, including position finding and fire direction. In its broader sense, however, the term has meant the science of arranging for the projectile (shot or shell) and the target (normally a ship) to meet at the same place and time. This sub-collection brings together some of the instruments and coast artillery fire control infrastructure available in Western Australia on Rottnest Island and Fortress Fremantle during World War 2 to achieve this outcome.