I have found a (very) strange way to decode
a part of it. Could it be possible that TCs
have no simple way to express tan?
they speak of cosine (in fact cos-1),
but no sine and no tan.
so a possibility could be

G
 GXhgDADghXG    tan-1 (X/2) = [30] = 18 = 30degrees
 GQBEBQfXfpG    p = 10X with X = 0.57735 from up line
 G...G          p = 11.5470
G

I agree, it is very strange, and I don't see
how it could work with next 3 lines.

Or maybe it is a way of showing something on some
circles. Kind of astronomical coordinates?

We should not forget that these 2 series
of 3 lines are linked with drawings coming
after them (in the same big couple of G's)
or maybe they are completely separated by a
double G (but it is less probable for me)

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