Thanks for the feedback! Yeah using the coordinates to get to the barrels is the main objective, but some people use the sonar exclusively for some reason. The game does have a progression and an end, but without scanning the materials and following the coordinates it doesn't progress.
I think people use sonar initially, because they think it's a exploration horror game. Where the objects are hidden until they bump into it, like how slender the 8 pages was. Also I think some people don't realize their being given the coordinates under the tutorial prompts. I know it took me a few seconds to realize those were coordinates.
Amazing game as usual though!! I know I loved it.