Zodiac Killer Map - Phillips map 66


The Zodiac Phillips 66 map has a symbol over Mt Diablo (Spanish for Devil).  Mt Diablo is the datum reference point for the map and the symbol over devil mountain is a surveyors symbol.

The whole Phillips petroleum map would have been referenced around this cairn on Mt Diablo as someone with a theodolite could see this reference point from many places.

This means Zodiac knows about how the map was made and has knowledge of surveying and how the early map was developed.

The symbol on the map is directly referenced over the datum point with request to set the symbol at magnetic north.

The symbol is that of a road surveyor or similar.  Are his murders referenced to Devil Mountain datum reference point?

These buttons he references are datum points.  Devil mountain is the origin point of how the map was created. 

His buttons as he calls them can also be datum studs which are used to place the theodolite staff on.  He may have been a civil engineer or road surveyor.

We have someone who knows map making, surveying, bomb making, encryption.

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