The above coordinates are not correct, but they are useful. The cache is located along this line:
y=2/19x
Break out your linear equation skills from high school and plot your way to a smiley.
How to Solve
If you can add or subtract the numbers "2" and "19" then you can solve this puzzle and find the cache. The equation represents the slope of a line that will go through the above coordinates. Using "rise over run", calculate at least 5 waypoints on either side of the starting location. All the waypoints will form a straight line on the map. The cache will be located at one of the waypoint somewhere on this line.

Now go act like Johnny Cash and Walk the Line
Creating Waypoints
Waypoint W1
Add (2) to the original North and add (19) to the original West to get:
N 33 49.584 W 84 06.985
Repeat as many times needed for additional West waypoints.
Waypoint E1
Subtract (2) from the original North and subtract (19) from the original West to get:
N 33 49.580 W 84 06.947
Repeat as many times needed for additional East waypoints.