We were out with Tucci in his newest Jeep truck, placing a few caches. We saw an open spot that looked like it needed a cache, so we stopped to place one --- then we realized it was across the street from a Jeep dealership.
When you get to the posted coordinates, you will be standing in front of an object supported/surronded by concrete. What color is the concrete? Plug that information into Certitude to get the coordinates for the final.
You can validate your puzzle solution with certitude.