Overhead
Build Notes
How the live flight radar, the night sky map, and the news feeds actually work — written up in plain language as they're built, not marketing copy.
2026-07-21
How Overhead's live flight radar actually works
ADS-B broadcasts, the free airplanes.live feed, why it refreshes every 45 seconds, and how the radius chips re-query the map.
Read the noteMore notes are coming roughly monthly — next up: the night sky map's projection math, and how the news feeds get merged from RSS.