The deadrise angle is the measurement of the angle between a horizontal line and the outer hull at a single point.

The deadrise angle is an important factor in choosing a transducer type, transducer placement, and whether to use fairing blocks (Transducer Fairing Blocks).

You can measure the deadrise angle with a smartphone application, an angle finder, a protractor, or a digital level. You can also ask your boat manufacturer for the deadrise of a specific point on your boat hull.