This is a field puzzle!
The cache is located at the coordinates listed above. Solve the puzzle at that location in order to gain access to the logbook. The logbook is contained within a standard red bison tube so use care when opening the container because the bison tube is not attached to the puzzle box. Please replace the bison tube and scramble the code when you are done so that others can enjoy the challenge.
Those of you who attended the ToGA Maker's Madness Event in April may recognize the container.
There are no useful clues to the solution on this webpage. I reserve the right to delete any logs that give away the puzzle solution.