The key components are :

Drivers Controller ICU500
Inner LED Sign NSI
Voice Unit DVA500
GPS Module (or external GPS source)

The ICU500 Drivers Controller can also be connected to the external destination signs, thus controlling all the vehicle signs from one unit.

The system is fully programmable. The sign messages, and their trigger points, are stored in the ICU500 Drivers Controller and the voice messages are stored in the DVA500 Voice Unit. Both the sign and voice messages are created and recorded on a PC, with the Mobi Info Edit (MIE) software being used for the sign message creation. This data is then transferred to the vehicle using a Flash Memory Card, similar to that used by digital cameras, etc.

The ICU500 initiates the display and the sounding of the stored messages by using trigger points associated with each available route. The trigger points are digitised locations where messages are to be initiated en route. Normally trigger points are set up to initiate a message which advises of the next stop, at some point soon after leaving the previous one. Another trigger point is then used to initiate a message to let passengers know when the vehicle is arriving, or arrived, at the stop.
The systems can also be used for safety messages.