Disclosure: The recent Z340 solution inspired me to look at the other Zodiac cryptograms. I am not an expert at all, but since I love puzzles, I took a look at the Z32.

I’ve detailed a possible Z32 solution in the link below. Because there are only 3 repeating characters, I don’t think there is a substitution solution, but instead it is a code for direction and distance. If he did actually point to something, I found two things that might fit with my solution.

https://z32solution.blogspot.com/p/z32-solution.html

I read through some of the other posts here before posting this solution. I see someone else saw the button connection between the Zodiac letters and Elaine Davis. I think this solution lends itself further to that connection.

Also, the area that I found for a possible "bus bomb" (I don’t think there actually was one) shows some interesting repeating concrete blocks. I don’t think they are bombs, but they sure caught my eye when I saw them on Google maps.