Final answer:
Sailboats and powerboats in the specified size range must have a rudder for steering and a lateen sail for sailing into the wind.
Step-by-step explanation:
In terms of regulations, sailboats and powerboats that are over 12 metres and up to 24 metres (39.4 feet to 78.7 feet) in length must have specific requirements. One of these requirements is having a rudder, which is a vertical blade attached to the ship to assist with steering. This helps make the boats more maneuverable. Additionally, sailboats in this size range usually have a lateen or triangular sail at the front, allowing them to sail into the wind by tacking.