When is the ideal time to release your anchor?

Releasing your anchor when your vessel is going slow astern is optimal because it allows for better control and positioning. When a vessel moves astern slowly, it can help ensure that the anchor is released smoothly and allows it to set properly on the seabed. This method also minimizes the risk of the vessel drifting off in an uncontrolled manner, providing more precision in anchoring.

Additionally, this technique reduces the chances of pulling the anchor out prematurely, which can happen if the vessel is moving too fast or when there is excessive wind or current acting against the vessel. Therefore, slowing the vessel while releasing the anchor enhances the likelihood that it will hold securely in its intended position.

While the other choices may seem reasonable in different contexts, they don't provide the same level of control and precision necessary for effective anchoring.