The Vasagatan has ten notes to find throughout the boat. I tried to list them in the order that you would come across them while exploring since the Vasagatan is more linear than the other story locations.
-On floor 1 (the basement) there are two notes. One is on a table in the large room and the other is in a locker that you have to open with the bolt cutters.
-On floor 2 there are three notes. One is on the bar next to the bullet item and the other two are in the safe with the electrical wires that you have to open with the four digit code.
-On floor 4 there is one note. To get it you have to craft the carjack in order to move the safe that is blocking the door.
-On floor 5 there is one note on a table.
-On floor 6, there are three notes. One is on the steering wheel and two are on the counter to the right.