Hologram's Revenge Mystery Cache

In order to find this cache, you must first find all the caches within a four (4) mile radius of the above coordinates. Inside each cache, is a question you must answer. The questions deal with U.S. and South Carolina history. You will be asked to provide letters from nouns. Once you have answered all the questions and obtained the letters, unscramble the letters to form four (4) words. These words will describe a nearby physical location, where you will find coordinates for the final cache, which is a .50 cal ammo box. Sound easy? We'll see.....