Position reference systems comprising software, hardware, cameras, lasers, radio-frequency identification (RFID) apparatus, and beacons for use in directing the motion, stopping and loading points for autonomous robotic vehicles, such as those used in warehouses, so that they may navigate around shelving and racking and other objects, collect specific goods from specific shelves or places, load them into a temporary container or storage device and deposit them at a defined point for onward distribution; robotic vehicle sensor systems, namely, GPS-aided and RFID-based navigation systems for use in navigating autonomous robotic vehicles within environments such as warehouses and storage areas; electronic devices for locating and tracking robotic vehicles using computer hardware, computer software and global positioning systems for use in locating autonomous robotic vehicles within environments such as warehouses and storage areas; robotic vehicle sensor systems, namely, GPS-aided and RFID-based navigation systems and electronic devices for locating and tracking robotic vehicles using computer hardware, computer software and global positioning systems incorporating laser, vision, magnetic, electromagnetic and RFID (radio frequency identification) based position reference sensors, reference targets or natural feature recognition, computer hardware and computer software; laser, vision, magnetic, electromagnetic and RFID (radio frequency identification) based position reference sensors for use with control applications; collision avoidance systems, namely, hardware and software that track the location of a robot by reference to various beacons pre-placed within the warehouse and stops it from hitting the shelving; collision avoidance systems incorporating laser, vision, magnetic, electromagnetic and RFID (radio frequency identification) based position reference sensors; collision avoidance systems incorporating laser, vision, magnetic, electromagnetic and RFID (radio frequency identification) based position reference sensors, reference targets or natural feature recognition, computer hardware and computer software; proximity sensors for automated guide vehicles and other mobile platform control applications; software for mapping the environment of automated guide vehicles and other mobile platform control applications; software for creating digital maps for use by automated guide vehicles and other mobile platform control applications; parts and fittings for all the aforesaid goods, namely, structural replacement parts