The following diagrams illustrate how some of these dimensions are measured and what various terms mean. Length of waterline is the length of the boat at the designed waterline. Beam is the overall width of the boat.
Draft is the depth of the hull structure below the designed waterline.
Hull depth is the overall height of the hull. Height overall is the height of the boat including cabin and windshield. The theoretical designed weight of the boat plus everthing aboard including passengers, gear, tanks, motors, etc. The displacement will always be more than the boat weight. The bare weight of the hull only, based on materials specified.