Jae Hun Hwang

When a solar storm hits, GPS does not fail loudly. It drifts, with no warning light. In May 2024, the strongest storm in over 20 years pushed farmers in the middle of planting season to park their GPS-guided tractors. This happens because existing warnings are written solely for scientists, and they provide only a single number for the entire planet. But a storm does not hit everywhere equally and simultaneously. Disturbance is strongest under the auroral oval, which moves toward the equator as a storm grows. A flare's X-rays affect only the sunlit side, and only while the flare lasts. A CME can reach the whole planet days later. The charged layer overhead differs from place to place. Solar-GPS-Guardian turns open NOAA, NASA and GFZ data into a plain 0-100 GPS risk score for where you actually are. It refreshes every 5 minutes and needs no login. Users can check their position, score a drive with a point about every 50 km, get email alerts for their region, and read a monthly AI-written recap. The score is calculated using a fixed formula through pipeline studies, while also allowing for flexibility to be improved through further research. If a feed goes down, the page reports the outage and continues scoring with the remaining active feeds instead of guessing.