GPS BASED PUBLIC ADDRESS & PASSENGER INFORMATION SYSTEM (PAPIS) & LED DESTINATION BOARDS IN AC AND NON- AC COACHES means "complete system including all related equipments, such as main processing unit (MPU), modem, GPS system, LED/LCD display units, PA system and LED display units for outside destination boards, IP65 compliant suitable power supply, audio amplifier unit, networking etc. as detailed in scope of supply including all associated sub systems and accessories, wires, fittings etc. to make the system fully functional".