Final answer:
To avoid a head-on collision between two powerboats, they can turn to the right, pass each other port side to port side, or one boat can turn right while the other turns left.
Step-by-step explanation:
In order to avoid a head-on collision between two powerboats, they need to change their direction to avoid each other. One option is for both boats to turn to the right, known as a starboard turn, and pass each other port side to port side. Another option is for one boat to turn to the right and the other boat to turn to the left, known as a crossing situation. It is important for both boats to communicate and take necessary actions to avoid the collision.