For the first image (the bigger one), the boat is on level +2, and has 4 objects.
Each float is equivalent to +1 for the boat level, and each anchor is equal -1.
In order to have 4 objects and a level of +2, the only combination is 3 floats and 1 anchor, so the level will be +1 +1 +1 -1 = +2.
For the first small picture, we have 2 floats in the boat, and its level will be 2 units above sea level (+2).
For the second image, the boat got two more floats, and it's going to go up, since more floats will raise the boat above sea level.
For the third image, the boat has 5 floats and 3 anchors, and it's located at 2 units above sea level (+2), since the 3 anchors will cancel out 3 floats, then it will remain the score of 2 floats, so +2 in total.
