The posted coordinates will take you to a utility pole, which is the starting point for this and the other two multis in this trio.
This multi will require a coordinate projection.
On the utility pole, you should find a six digit number oriented vertically under the letters "UD". Reading from top-to-bottom, call this number ABCDEF.
To get to the final stage, go E(C+B)(D+F) feet at A(D+A)°. (The final is in Del Campo Park.)
These are the other two caches in the trio that have the same Stage 1:
GCB1R92 (Easy Peasy)
GCB1R99 (Averages)