To obtain the coordinates for the bonus cache you need to answer one or two questions at each preliminary cache. The questions will concern a plant or other feature listed on an information sign close to the cache itself. When answering the questions use the following number code:
n = 0: Woodpecker
n = 1: Rust color
n = 2: Dark blue
n = 3: Red
n = 4: Butterfly
n = 5: Pale green
n = 6: Dark green
n = 7: Grayish white
Here are the questions for each preliminary cache. Use the answers, and a little arithmetic, to find J, K, L, X, Y, and Z in the final coordinates.
Fearrington Flora 1: What color is the fruit of this plant? J = n + 1
Fearrington Flora 2: What color are the berries of this plant? K = n + 2
Fearrington Flora 3: What color are the hairs on twigs of this plant? L = n + 1
Fearrington Flora 4: What color are the leaves of this plant? X = n + 2
What color are the berries on this plant? Y = n + 3
Fearrington Flora 5: What creature is represented on this memorial plaque? Z = n + 2
This cache can be found at North 35 48.JKL West 79 04.XYZ.