Using a sea anchor with your survival craft will primarily serve to:

Using a sea anchor with your survival craft primarily serves to reduce your drift rate. When deployed, a sea anchor creates resistance against the water's current and wind, effectively slowing the movement of the craft. This is crucial in survival situations where maintaining your position is essential to stay in a known area or to make it easier for rescuers to locate you. By minimizing drift, you increase the chances of being found and can conserve energy, as the craft remains in a more stable position.

In this context, while stabilizing the craft is beneficial, the main function of the sea anchor is to counteract the forces that cause drift, keeping you closer to a specific location. Other functions, such as increasing buoyancy or making signaling for help easier, do not directly correlate with the primary purpose of reducing drift rate, although they may play supportive roles in overall survival scenarios.