Frost, A. creator text 82 Britain Glasgow 1982 1st ed. monographic | 0 xix, 145p. Marine Gyro Compasses for Ships' 0fficers has been written to cover the syllabuses for all grades of Department of Trade certificates of competency for deck officers in the Merchant Navy. The first section of the text discusses the free gyroscope and its properties which enable it to be converted into an instrument which provides a north reference. 623.892 FRO 0851744265 230619