x = 4.226182617407E-5 y = -9.0630778703665E-5
gc = 51.502686111111, 3.6157972222222 gcx = 51.502686111111 gcy = 3.6157972222222
51.502728372937, 3.6157065914435
51° 30' 9", 3° 36' 57"