South Carolina's Verdenskortet Mystery Cache

Jacorp: Unfortunately, the park where the cache was placed and where the puzzle was meant to be solved - SCALE Park - no longer exists, and the puzzle is no longer solvable. I have been forced to archive the cache. Here's the solution to the puzzle if you're curious:

[map] → (3, 1, 31, 1)
[south] → (3, 1, 30, 3) or (129, D1, 25°42'51.5"N 80°17'55.3"W)
[scale] → (3, 2, 3, 2)
[wood] → (87, 2, 10, 1)
[wood sign] → (87, 2, 10, 1) (9, 15, 2).
[rate] → (88, 1, 14, 8)
[path] → (304, E10, 42°26'39.7"N 106°48'31.3"W, first part only)
[light years] → (68, “Gur Ubzr Tnynkl [The Home Galaxy]”, 1, 3, 4 and 5)
[submarine] → (ISBN 0-471-41291-0, 187, 1, 8)
[sign] → (9, 15, 2)
[plaque] → (314, F9, 30°20'23.9"N 91°38'12.8"W, first part only)
[right] → (12, “Greevgbevny Frn [Territorial Sea]”, 2, 4)
[left] → (18, 5, 1)
[date] → (220, C10, 42°28'52.3"N 140°45'51.3"E) or 42°28′N 140°52′E

Key word: [SCALE]

The field puzzle for this cache will take you to a local attraction with this word in its name. (SCALE Park)

Once you arrive at this location, take the [path] to the [left]. Look at the first blue and white [sign]. There are two numbers under the word [rate] on this [sign]. Let the first one be A and the second one be B.
Continue on the [path] for 6.342e-15 [light years] (200 ft). You will come to a [wooden sign]. There is a [plaque] on the [right] side of this [sign]. Use the first number as C.
For the last number, some knowledge of South Carolina history and geography will come in handy.
[Submarine].
Use the last number of the [date] for D.

AD° N BC° W
[34 N 81 W]
[Apprx. coordinates of Columbia, SC: 34° N 81° W]

Hint:
What location? [SCALE] [Park]
The [map] on the back of the [wooden sign] should help you see the [SCALE].

SCALE Park was a scale model of the state of South Carolina, and the coordinates for Columbia would have pointed you to the gazebo that was in the center of the park representing Columbia. The cache was hidden under it.

It's sad to see one of my favorite childhood places gone now, even if it appeared to be a small, unremarkable local park. It's being replaced by a daycare though, so I'm glad the land is being put to good use. It could be a lot worse. But it does mean that access to nature is harder now, especially for those who can't travel far.