Consider:
A = N51 31.318 W000 09.188
B = N51 30.699 W000 12.247
C = N51 31.848 W000 14.858
D = N51 24.475 W000 13.616
E = N51 36.507 W000 06.179
F = N51 33.994 W000 17.679
G = N51 33.788 W000 08.836
H = N51 33.170 W000 14.452
J = N51 32.853 W000 11.020
K = N51 30.118 W000 07.535
L = N51 29.466 W000 11.234
M = N51 22.868 W000 04.477
Cache is at:
N51 PQ.RST
W000 UV.XYZ
Where:
P = (H-M)
Q = (D+G)
R = (C-K)
S= (E+F)
T = (A-J)
U = (B-L)
V = (G+J-K)
X = (F+M)
Y = (C-L)
Z = (A-D)