At the posted coordinates you should find a signpost with 4 seperate signs. On the back of the top sign is a small label with a 6 digit number with a checksum of 20.
That 6 digit number is in the form of 000ABC
The cache is at DE feet @ FG°
Where:
D = .75(A)
E = C
F = .5(A)
G = A/4
D + E + F + G = 19