You will notice railings on the ship this is designed for if a compartment is breached that ship personal have something to grasp and hopefully pull themselves to safety. The Bulls-eyes are put all around the ship per each compartment to tell where you are on the destroyer. This is the armory and showing the Bulls-eyes in representation of the ships frame number from Bow to Aft and Port to Starboard This is the classroom or lecture room. The medical wing for treatment of injuries This is the Wardroom, used for meetings from classified to not. It also comes equipped with SCIF mode so the door can lock and no one can be disturbed.
Head over to the "Maps" page and select "New Map" in the upper right hand corner. It's pretty straightforward from there