During anchor drops, what is the essential signal when the anchor touches the bottom?

The essential signal when the anchor touches the bottom is "Anchor set." This indicates that the anchor has not only been deployed but has also successfully dug into the seabed, providing a secure hold for the vessel. The process of determining if the anchor is set involves monitoring the vessel's behavior as well as checking for drag.

Once the anchor is confirmed to be set, it gives assurance that the vessel will remain stationary and not inadvertently drift due to wind or current. This signal is crucial for the safety of the vessel and crew, as it confirms the effectiveness of the anchoring procedure.

Other options may be associated with different points in the anchoring process: "Drop anchor" is typically a command to release the anchor, while "All clear" usually indicates that the area is safe for operations or movement, and "Anchors aweigh" means the anchor is completely lifted off the bottom and the vessel is free to move. Each of these terms relates to different phases of anchoring but does not signify the critical moment when the anchor touches and sets into the seabed.