I'm trying to understand some details related to the map in featured in Star Wars: The Force Awakens. When we first see the map in the beginning of the movie, it is a region of space with a line presumably showing where
Luke has been. Later, when R2-D2 is re-activated, we see this part of the map as a section in a greater whole.
My sense is that the first piece of map is the end of
Luke's journey. That way, if someone hacked R2-D2, then they couldn't figure out exactly where in the region he has gone.
This raises an interesting question though. When they put the first piece of the map into R2's larger portion, it looked like a huge section of the galaxy.
It seems like even with our technology, you could identify some of the stars and be able to figure out where that is. If it were only a tiny part of the galaxy, then I could understand if it weren't mapped sufficiently to be able to do that.