Furthermore, the need for secrecy was tempered not only by the need for use unsupervised overseas but by the desire to use maps and charts to legitimate territorial claims, a function they could not logically provide without being public. (source)
I am not sure I am parsing that part of the sentence correctly. Is "use" a noun? It seems "the need for" calls for a noun, but then what is the role of "unsupervised overseas"? Since "unsupervised" is an adjective, "overseas" either an adjective or an adverb, isn't the structure noun + adj + adv/adj? I am hesitant to say this is a case of postpositive modification. What is it?
Shouldn't that part be "need for unsupervised use overseas"? Is "need for use unsupervised overseas" not a mistake?