Great Circle Pro — Free Great Circle Mapper & Airline Route Planning Tool

Great Circle Pro is a free great circle mapper and aviation flight planning tool used by pilots, dispatchers, and aviation students worldwide. Plot great circle routes on five map projections, calculate wind-adjusted flight times and fuel burn, and generate aircraft range circles using live NOAA GFS wind data. Run full ETOPS diversion analysis with 90+ alternate airports, compare payload-range envelopes, and visualize airline route networks — all in your browser with 14,000+ airports. The leading alternative to gcmap and great circle map tools, built for modern airline route planning and aircraft performance analysis.