Do not go to the posted coordinates, nothing is there!
This cache idea comes from GC8KJ9M in Scottsdale. Thanks to MindlessEngine for the idea!
There are four steps to solve:
First - Determine the names of the points of interest by filling the following blanks:
_________ C A S
Yuma _________ Prison
_________ Sun Stadium
_________ Casino
_________ to _________ Bridge
_________ Patch
_________ Bridge
Yuma _________ _________ Open Air Museum
_________ _________ Plaza
_________ Pass
_________ Gardens
Yuma _________ Fairgrounds
Second - Match the names to the following pictures.
A: 
B: 
C: 
D:
E:
F: 
G:
H:
J:
K:
L:
M:
Third - Use a certain common ordering mechanism to assign a value from 1 to 12 to each location name.
Finally, plug in the picture values:
North 32o [(E * G) + L] . [(A * C * K) + (J * B)]
West 114o [(B * D)] . [(F * M * C) + (H * G)]