Ok, based upon Zodiacs use of the Phillips 66 map, and his placement of the button surveyors symbol over the Dennings Mt Diablo Initial Point, Benchmark: HS5120, I have adjusted the meridian accordingly over the official coordinates of the Mt Diablo Dennings Initial Point Meridian.

Other adjustments have to be made according the Zodiacs request.  Dennings history in USMC and Zodiacs skillsets may suggest he has military background, possibly Special Forces etc of the day. Bomb making, Map making, Surveying, Crime scene firearm usage.

S = (R(map inches) * θ)




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