A lot of people freak when they see things in Hex!
It's like reading a different language! Now I've been working in Hex for over 30+ years! I can pick out patterns as to how a file is constructed. There is usually a lot of information about the file size, content numbers, how much data to read, and so on. Usually the header is a Map of sorts.
Then you just need to follow the data. That may mean looking at a bunch of different files to get the 'BIG' picture.
In one of your images above you have a captains log. I'd like the save game with a captains log image that goes with it!
Cross referencing other files? I may be able to track down where that is in the save game.