The cache is not at the posted coordinates.
But you should start here.
The Interstate Highway System is a system of freeways in the United States. It was first designed by Dwight D. Eisenhower in the 1950s. The Federal Aid Highway Act of 1956 was used to pay for construction. It was mostly built from the 1950s through the 1980s, but more freeways were built later. It is now about 47,000 miles long. Some interstates have tolls, but most do not. Most interstates have rest areas every few dozen miles.
To be an Interstate Highway, there cannot be any stoplights. To get on or off the freeway, an interchange is needed. The speed limit varies from 55 to 80 with a couple 85 limits. It must have at least two lanes going each way. The lanes must be at least 12 feet wide. There has to be a median or barrier between cars going different directions.
North-south interstates have odd numbers. The numbers go up from west to east. East-west interstates have even numbers. The numbers go up from south to north. One and two digit freeways go long distances. Three digit freeways go into or around cities. Freeways that go into cites are called spur routes and start with an odd number. Freeways that go around cities are called loop routes and start with an even number. The last two digits in a spur or a loop route are the same as the freeway it started from.
I'm planning a long trip around the country. Using the questions about my various destinations, you should be able to solve for the proper coordinates.
I'll start in the Salt Lake City area.
A. I'm going north first because I love the Tetons and Yellowstone. The interstate I will take is ___
B. There are wonderful sights in Montana. I'll check out the Geocaching headquarters next and I'll use what interstate to get there?
C. I want to see the Redwoods so that interstate would be ____
D. After the Redwoods and San Diego, I'll to to Phoenix. Next would be the Grand Canyon. Going north, what interstate will I take?
E. Marti gras can be a great time if you like a lot of people partying. I like it quieter so I'll use the interstate north of town.
F. On the way to New York, I'll stop at the birth place of my favorite country singer, Hank Williams. The interstate I'll use get there will also take me through Meridian MS. ___.
N 41° 30.(A-11) ((B-18)/9) C-3 W 112° 03.(D-1)/4) E/3 (F+1)/12