A puzzle dedicated to all of you who have found 151 caches. How well do you know the 151? 
There are three stages to the puzzle.
Stage 1: Fill in the grid. You need the first 151. No repeats. Two squares are already filled in with the correct characters in black.
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| Right click and "Open" to get the full-sized image. |
Stage 2: Once you have finished stage 1, transfer the character you got for each of the white lettered or numbered squares from the big grid to the set of squares here. Use these sequences
ABCD EFGH IJK LMN OPQ
RST UVW XYZ 2345 6789
Stage 3: Get the final coordinates and off you Go!
A big thank you to Arturo who kindly allowed me to build on his original idea, and who beta tested this puzzle.
2021 update: Unfortunately it has just been picked up that there is a small sand subtle error in one square which many of us missed for a very long time. It is where there is a blue and green square which is 2 down and 4 to the right of the Q square. Thanks to atsmug for spotting it. Please contact the CO if you come across this and need help.