How many shots must be on deck when dropping an anchor with four red links?

When anchoring a vessel, the number of shots on deck is crucial for ensuring that the anchor is dropped effectively and safely. The term "shots" refers to sections of anchor chain, with each shot typically being 15 fathoms (90 feet) long.

In the case of three red links, each red link indicates the length of chain that should be handled as part of the anchoring process. When there are four red links on the anchor chain, this means that four full shots should be on deck to ensure that the anchor can be effectively deployed. Having the necessary number of shots on deck allows for adequate control and ensures that the anchor can be set properly, especially in deeper waters.

Thus, having four shots on deck, corresponding to the four red links, ensures sufficient hold and control of the anchor chain when carrying out the anchoring procedure. This practice follows nautical conventions for safe operations while anchoring a vessel.