Starter project. Now it just needs a game to be built around it :-) Maybe make it an ICBM interception game? (A north polar view would be better than this one ;-) )
In a real radar the planes would not move between being highlighted on each sweep. However this makes for a more visually interesting game. But you're welcome to change that (just keep track of where x and y would be but don't actually move to them until the radar beam first hits the plane) Beam image from @peppermintpatty5 (https://scratch.mit.edu/discuss/topic/110084/ ) Overlay from http://scienceray.com/category/technology/