This colorfully updated book discusses the ongoing important role of spread moorings in the offshore drilling industry.With expert input from Christopher Morlan, marine structural engineer with SBM Atlantias Mobile Offshore Unit, this text explains the main principles of mooring line behavior, anchor holding power, and deployment and retrieval methods.The specific challenges of holding on location and the equipment used to maintain position above the well are described in detail. Readers receive basic historical and operational perspectives with enough technical depth to understand concepts. This lesson is for all offshore personnel and assumes readers are familiar with drilling procedures on land. Detailed descriptions, illustrations, and useful tables help demonstrate concepts.