The story of Isaac Brock is known fairly well by a lot of the locals around Waco, for the rest, it is an easy to solve puzzle.
The posted coordinates will take you to the grave marker for Isaac Brock. To find the coordinates for the final container, find the number of years old that Isaac was when he died, put a decimal in front, .xxx, add these numbers to the North coordinates of: 31 39.035 and use the West coordinates of; 097 19.036.