Abstract: Technology for generating and displaying a graphical user interface for operating an unmanned aerial vehicle (UAV) is disclosed herein that generates and updates a representation of a spline flight path. In various implementations, a graphical user interface detects user interactions with a remote control device directing the flight control subsystem of the UAV to record keyframes and to compute a spline based on the keyframes during flight. The graphical user interface displays a real-time perspective of the UAV with a representation of the spline and the keyframes overlaying the view. The graphical user interface continually updates the representation as the UAV flies and when the spline is updated as the keyframes are updated.

Abstract: A system for storing water in or under a concrete slab of the type in which one or more void forming elements are used to form one or more voids in the concrete slab. The system comprises one or more water storage means, such as pipes (12, 14, 26, 18 and 20) positioned in the one or more void forming elements (10) and at least one port (26) for supplying water to the one or more water storage means. The void forming elements may be boxes.