That map seems to be drawn by someone who was caught on the island and was trying to figure out what it was. Someone smart enough to know latin and someone who was there for quite a while.

All those quotes of being sad and depressed somewhat remind me of Marvin the paranoid android from Hitchhikers Guide to the Galaxy.

Also, I don't think that CV I, CV II, etc. are one big roman numeral because there is a space between the CV and the II. So it's probably initials followed by a number, ex: Compound Vault 1, Compound Vault 2, etc.

**edit** A couple of the hatches are drawn with dotted lines, my guess is because whoever drew the map couldn't access or find those hatches.