Visualisation of GPS data recorded on the flight of Greater Sapiens around the earth including a trip to Antarctica. There are 31,716 locations recorded. In this image you see 18,858 points. You can see all data in my Display Geo Data App. You can Measure the Radius of the Earth with the App from the GPS data.
The total length of the trip is 59,360 km. On the Flat Earth the trip would be 122,234 km, which is 2.1 times too much.