Which of the following describes the function of a sea anchor when utilized as a tool for beaching a lifeboat through surf?

Correct Answer: Option D — it can be used to control the speed of a survival craft while maintaining the heading

The sea anchor acts as a drag device to maintain the lifeboat's heading into the wind and seas. By controlling the speed of advancement, it prevents the craft from surfing on waves, which is essential for maintaining control and preventing the boat from broaching during a surf landing.