The use of the gyrocompass for naval navigational purposes is examined. The design and operation of the Foucault gyrocompass, along with a practical model of a gyrocompass is presented. Gyroscopic steering instruments and ships stabilizers are discussed. The use of gyroscopes in mining engineering is examined, with particular attention given to a gyroscopic stabilizer of a magnetometer and a mine surveyors gyrocompass. Finally, the use of the gyroscope for military purposes is studied.