. . "gyrocompass" . . "gyro-angle setting" . . "gyro compasses" . . . "north seeking laser gyrocompass" . "gyro-compasses" . . "gyro-compass" . . . . "electronic northfinder" . "gyroscopic compass" . "Sperry Gyro Compass School" . "gyroscope" . . . . "gyroscopic ship stabilizer" . . "gyroscopic compasses" . "Gyro-Compass" . . "Gyrocompass" . "Compass" . . "Gyrocompass" . . . "gyro compass" . "gyro" . .