The cache is not at the posted coordinates! You will, however, need to go to the posted coordinates and glean information to obtain coordinates to the next stage. Multiple stages will ultimately get you to the hiding place for the container. The posted coordinates bring you to a stone sign that represents those who provide public engineering services in peace and war to strengthen national security, energize the economy, and reduce risks from disasters.
The next stages will take you to points paying tribute to the incredible sacrifice of those local lives lost in service to their country and ultimately to the location where you will need to find the cache container, part of it representing a material of great importance in World War I and World War II.
About the Stages and final location:
On all stages' coordinates, use letters' position in the alphabet (example: A=1, B=2, etc). The letters P through Y will instead be used as placeholders in each stage for the answers to a few simple math problems.
From the posted coordinates:
You will use the stone sign on the ground to determine the coordinates to the next stage. Resolve the coordinates for the next stage N39 31.PQR W75 48.STU.
In this stage only:
P= Sign's 3rd letter + Sign's 5th letter
Q= Sign's 4th letter - Sign's 3rd letter
R= Sign's 3rd letter + Sign's 4th letter
S= Sign's 4th letter + Sign's 5th letter - Sign's 3rd letter
T= Sign's 3rd letter + Sign's 4th letter
U= Sign's 3rd letter + Sign's 4th letter + Sign's 5th letter
Go to the coordinates represented above as N39 31.PQR W75 48.STU. Please be respectful at this location.
At this location, You will then need to identify the First person's name under the "Killed in Action" section and resolve the coordinates N39 31.SPP W75 48.PUV to take you to the next stage.
In this stage only:
P= Position in the alphabet of the 1st letter of the person's last name
Q= Position in the alphabet of the 2nd letter of the person's last name
R= Position in the alphabet of the 3rd letter in the person's last name
S= Position in the alphabet of the 4th letter in the person's last name
T= Position in the alphabet of the 5th letter in the person's last name
U= S-Q
V= R-S
Go to the the coordinates represented above as N39 31.SPP W75 48.PUV. Please be respectful at this location. You will then need to locate Harry's Last name and resolve the coordinates N39 31.UVU W75 48.XXY using the letters below to take you to the final stage.
In this stage only:
O= Position in the alphabet of the 1st letter of Harry's Last name
P= Position in the alphabet of the 2nd letter of Harry's Last name
Q= Position in the alphabet of the 3rd letter of Harry's Last name
R= Position in the alphabet of the 4th letter (2 digit number) of Harry's Last name
S= Position in the alphabet of the 5th letter of Harry's Last name
T= Position in the alphabet of the 6th letter of Harry's Last name
U= P+S
V= O+P
X= Q-P
Y= O+S
Go to the coordinates represented as N39 31.UVU W75 48.XXY above. You are now at the final stage, where the cache container is located. You will need to locate it, part of which representing something of great importance in World War I and World War II.
I hope you have enjoyed this Multicache!"