This is the Scubapro FS-1.5 Scuba Diving Compass Capsule ONLY Compass Module Features: A compact and durable instrument for precise underwater navigation. Mounted in a pressure-resistant oil-filled polycarbonate housing. Calibrated to the Northern hemisphere. 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.