The cache is not located at the posted coordinates. But an accessible boat launch is there!
Solve the puzzle below to have the final location revealed. The final is located along the shore of Acton Lake and is best accessed by shallow draft hand powered watercraft.
For full details about the series see https://coord.info/GC8E840
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A minuscule, insignificant, or indiscernible amount of difference. Often used in the negative for extra emphasis. A dime's worth of ----------
You can validate your puzzle solution with certitude.