Visit each of the 11 waypoints and identify which of the photos below (labelled A to L) was taken at each waypoint. The waypoint number (1 to 11) will give you the value of the letter, and thus the information you need to find the (nano) cache, which is at:
S 37 48. [C-G] [H-E] [E-(2xK)]
E144 57. [B-J] [A+J-F] [L-D]
If you know your CBD well, you may be able to do this from the comfort of your own home. Please note in your log how many of the waypoints you actually visited!