The 35 mm anti-aircraft gun “GDF 103 AA”  can be operated in two ways:

- Normal mode is automatic when GSN operators control the entire gun as part of the battery.

- If the gun is not connected to GSN, it can operate independently and successfully engage targets, in which case the Ferranti sight is used and normally the generator Group (GE/PSU) will provide the power required to operate the gun via the joystick. All sight devices can also be operated manually from the direction and height actuating levers when there is no power source.

In the image below identify the two action elements!