Final answer:
To rotate the stern away from the dock, secure a spring line to the dock and the stern, use forward gear to pivot the boat as the bow moves out, and control the motion with the spring line's tension.
Step-by-step explanation:
When leaving a dock, you can use a spring line to rotate the stern away from the dock by securing one end of the spring line to a fixed point on the dock and placing the other end on a cleat at the stern of the boat. The engine is then gently put into forward gear, which will cause the boat to move forward but the tension in the spring line will prevent the stern from moving out. As a result, the bow will move out instead, effectively pivoting the stern away from the dock. Use the wheel or rudder to aid in directing the pivot as needed. It is important to monitor and adjust the tension in the spring line to control the motion of the boat and prevent damage.