21. The gyrocompass was introduced in the early part of the 20th century and inertial navigation in the 1950s. 22. After reading the gyrocompass article, I spent a long time trying to figure out how it works. 23. There was an automatic pilot function driven by either gyrocompass or magnetic compass as the input heading source. 24. On 1 March the U-boat's gyrocompass broke down, necessitating a return to port. 25. He also was a pioneer of the gyrocompass , being the first to create a full theory of it. 26. They suffered from gyrocompass failures at high speeds, unhooked bomb shackles, engine fires, and inaccurate cockpit gauges. 27. When navigating in the Northern Hemisphere, special techniques can be used with Polaris to determine latitude or gyrocompass error. 28. After eleven months of gyrocompass instruction at the Admiralty Compass Observatory ( Ditton Park, HMS " Victory ". 29. The outer casing of the gyrocompass device is held in such a way that it remains aligned with the local plumb line. 30. The vehicle is fitted with a PAZ overpressure NBC system and fire suppression system, and carries a GPK-59 gyrocompass .
