An apparatus associated with a power driven wheelchair and a method of calibrating one or more operating parameters of a power driven wheelchair are disclosed. The apparatus comprises one or more input devices (64) for selective activation; and system controller (32). The system controller comprises a mounting portion for mounting the system controller to the power driven wheelchair; a display device (66); a first non-volatile storage device (70) storing one or more sets of calibration parameters associated with operation of the power driven wheelchair and a microcontroller. The microcomputer (82) comprises logic that controls display of the interactive screen on the display device; and logic that controls selection and modification of one or more calibration parameters stored on the first non-volatile memory device in response to activation of one or more input devices.