The cache is not located at the posted coordinates. 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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Draw a straight line between posted coordinates for #4 and the posted for #2. That's the angle. The distance from the posted coordinates for #2 and the cache is .13 miles.
You can validate your puzzle solution with certitude.