How Does GPS Actually Know Where You Are?

Create a 60-second engineering explainer video titled: “How Does GPS Actually Know Where You Are?” Explain GPS from the engineering level: satellites, atomic clocks, radio signals, signal travel time, trilateration, receiver clock error, and position calculation. Visual requirements - Every slide must contain at least 6–8 separate, clearly distinguishable visual objects. - Prefer independent objects rather than one large connected illustration. - Reveal the objects progressively as the narration explains them. - Use diagrams, arrows, equations, labels, clocks, satellites, Earth, receiver icons, signal waves, coordinate markers, etc. - Keep the visuals technically meaningful rather than decorative. Cover: 1. GPS constellation — Earth surrounded by multiple GPS satellites in different orbital positions. 2. Satellite transmission — show a satellite, atomic clock, timestamp/data packet, antenna, radio waves, Earth, and a phone/GPS receiver. 3. Distance measurement — visualize how the receiver calculates distance using Distance = Speed of Light × Signal Travel Time. 4. Trilateration — show three satellites with three separate distance spheres/circles intersecting near the receiver. 5. Why a fourth satellite is needed — explain that the cheap clock inside your phone isn't synchronized precisely enough with satellite atomic clocks, so a fourth measurement solves the receiver's clock error. 6. Final position calculation — show four satellites, signal paths, receiver, latitude, longitude, altitude, calculated position marker, and a simplified coordinate/grid visualization. End with the idea: Your phone doesn't ask the satellites where you are. It measures precisely how long their signals took to reach you — then calculates where you must be.