Hop on over to the library for a puzzle cache. The posted coordinates will bring you to a plaque in front of the library. Use information on the plaque to figure out the coordinates for the final.
Cache is located at: N37 40.B3Z W077 35.ZDF
This library opened on July X, 200Z.
B=X-3
F=Z-1
City 16DD
BYOP
You can check your answers for this puzzle on GeoChecker.com.