This is a one stage multi.
Find the number on the bus stop pole; read bottom to top.
The cache can be found at: S 43° 3A.BCD' E 172° 4P.QRS'
A = 2nd number divided by 3
BC = total of the numbers minus 2
D = 4th number divided by 2
P = Add 3rd number and the last number
QR = first two numbers + 20
S = (1st number + 11) / 9
South checksum: A + B + C + D = 12
East checksum: P + Q + R + S = 24