Help to extract symbols for (degree, minute and seconds) from textual pdf to dataframe/matrix.

General
1

I have a pdf with text only. The data is in table format. One column contains coordinates with degree, minute and second symbols. The problem I am facing, is on extracting the data, those symbols are converted to noise. How, can I preserve these symbols in the data frame.

library(tabulizer)
a = list(c(121.8,14.4,251.3,403.2))
b = tabulizer::extract_tables(file = "http://www.aip.net.nz/pdf/supplements/aip_supp_7nov19.pdf",pages =  8,area = a)
c = do.call(rbind,b)

Here,
39°41’18”S 174°42’12”E should look like 39°41’18”S 174°42’12”E.
How, can I do this?

Thank you, for your time and effort.

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