### Flat earth map

In this figure you see the shortest path for sailing around the world on a flat plane:A = 25E-45W, 60-22,5-50 South

B = 45W-75W, 50-70 South

C = 75W-150E, 70S-30N-60S

D = 150E-115E, 60S

E = 115E-25E, 60S-0S-60S

### Average latitude

lat-av-A = (55+22.5)/2=38,75 = 128,75lat-av-B = 60 = 150

lat-av-C = (155+60)/2 = 107,5

lat-av-D = 60 = 150

lat-av-E = (60+0)/2 = 30 = 120

### Average radius (lat+90)

rad-av-A = 2*pi*6371*(128,75/360) = 14.316 kmrad-av-B,D = 2*pi*6371*(150/360) = 16.679 km

rad-av-C = 2*pi*6371*(107,5/360) = 11.953 km

rad-av-E = 2*pi*6371*(120/360) = 13.343 km

### Approximate distance

dist-A = 2*pi*14.316*(25+45)/360 = 17.490 kmdist-B = 2*pi*16.679*(75-45)/360 = 8.733 km

dist-C = 2*pi*11.953*(180-150+75)/360 = 21.905 km

dist-D = 2*pi*16.679*(150-115)/360 = 10.188 km

dist-E = 2*pi*13.343*(115-25)/360 = 20.959 km

Total distance = 79.275 km = 42.805 seamiles

As they can sail around the world in 109-74 days they would sail at an average of 24 knots. This is very possible as for-instance the Groupama 3 has an average of 33 knots per hour. Or ABN AMRO TWO at 23 knots per hour.

Fore-going calculation is an approximation as we don't know what the real shape of the earth is and as we don't know what the correct map of the supposed flat earth looks like.

Source on speed: http://yachtpals.com/fastest-sailboats-2079

Original map source: http://www.hayatinanlaminedir.com/flatearth-grubundan-net-aciklama-dunya-yuvarlak-degil-duzdur/, https://www.theflatearthsociety.org/forum/avr/avatar_1460116_1463417280.png