Analyze rock and mud to detect the presence of oil.
Directs activities of boat-repair service, according to knowledge of maintenance needs of small craft and marine safety requirements: Confers with owner or crew of vessel to obtain maintenance history and details concerning condition of craft. Observes and listens to vessel in operation to detect unsafe or malfunctioning equipment and leaks or other flaws in hull and superstructure. Performs tests on vessel and equipment, using gauges and other standard testing devices. Estimates cost of repairs according to familiarity with labor and materials requirements or fee schedule. Directs and coordinates activities of workers engaged in repairing, painting, and otherwise restoring vessels to seaworthy condition. May repair vessels, assisted by other workers.