What action should be taken if dragging anchor is suspected?

When dragging anchor is suspected, the most appropriate action is to pipe the anchor detail and start the mains. This action prepares the crew to respond quickly and efficiently to the situation. By calling the anchor detail, you ensure that those responsible for the anchor are on alert and ready to take control of the vessel's anchoring mechanisms. Starting the mains provides the necessary propulsion to maneuver the vessel if it begins to drift due to dragging anchor. This combination allows the vessel to regain control and reposition if necessary, thus enhancing safety and stability.

While increasing speed can sometimes help control the vessel's position, it doesn't address the immediate need for crew readiness or anchoring procedures. Dropping an additional anchor can be a reactive measure but can also complicate the situation if the primary anchor is not securely set. Sounding the foghorn may enhance visibility to other vessels but does not directly address the issue of dragging anchor or help in regaining control of the situation. Thus, piping the anchor detail and activating the mains is the most prudent response in this scenario to ensure safety and readiness for action.