The instrumentation at Mount Imbiah compromised of three Depression Position Finders at Imbiah Fire Command and each of the PF Cells (only one shown here). In addition, there was a Depression Range Finder in the Battery Command Post. The 9ยท2 Inch Gun had an Auto Sight. The Auto Sight will have been linked to the range and position finding equipment. The Glossary gives basic information about these instruments.