An FFGL source that's a radar watching a synthetic sea, and an effect that makes your clip the sea. A plan-position indicator is a CRT whose trace runs out from the centre along the antenna's bearing as the antenna turns, painting every echo onto a long-persistence phosphor. Nothing here is a drawing of a radar. A reflectivity field goes through a radar model, so targets paint arcs as wide as the beam and streaks as long as the pulse, the sweep leaves a fading trail, near returns are huge until STC flattens them, clutter crowds the centre, coasts facing the radar are bright edges with shadow behind them, and moving contacts leave a plot of their track.
This demo runs the plugin's shaders and a port of its sweep timing in your browser, so it needs JavaScript and WebGL2. The plugin itself, its source and its downloads are on its repository.