This is the Scubapro FS-1.5 Scuba Diving Compass and Optional Retractor Features: A compact and durable instrument for precise underwater navigation. Mounted in a pressure-resistant oil-filled polycarbonate housing, this compass is easy to read and easy to use. Calibrated to the Northern hemisphere. Available in wrist-mount or retractor versions. A compact and durable instrument for precise underwater navigation. Mounted in a pressure-resistant oil-filled polycarbonate housing, this compass is easy to read and easy to use. Calibrated to the Northern hemisphere.