Source: Zodiac Unmasked- Graysmith, R.
Much of what the Zodiac wrote was probably in code, that is things that didn't seem to make sense were probably translateable into other meanings - either people, places, or things. The Zodiac symbol is, for example a polar co-ordinate. Also the letters [BEORIETEMETHHPITI ] in August 1969 isn't a name but more important a location that locates the murderer's location. The letters are laid out in algebraic fashion on a graph with the graph laid out on a north-south to east-west grid on principle streets or landmarks in the San Francisco area, with random letters inserted as a filler to make the line come out even in respect to characters per line. In mathematical fashion, the accuracy of this graph could easily pinpoint the location to a specific location in a specific room in a specific building.
All characters are numbers and both co-ordinates are followed by numerals after the decimal point. This type of mathematical plotting is used in mechanical engineering and would be used by anyone familiar with science. Since the suspects had been sailors at one time, the characters could stand for degrees of latitude and longitude. This can be used after compensating for deviation and variation on a magnetic compass to pinpoint a location to within sixty feet, plus or minus. You could use an-aircraft map of the area of summer 1969 vintage to plot the isogonic lines properly, inasmuch as the location of the earth's magnetic pole does change slightly from year to year. Latitude and longitude are given as a series of numbers followed by a letter, in degrees minutes and seconds.
Personally it seems like a lot of work to ferret out all these letters so I'll stick to the 340 symbol cipher. However, if you notice, there seems to be a pattern of the Zodiac's misspellings and if one were to take the time one might find a message within a message in a lot of his writings.
By the way, what was the numerical address of that house on Jackson Street? ??12.?
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