A gyro compass is a navigational device that uses a spinning gyro to determine true north. However, there are several synonyms for this term, including the gyroscopic compass, gyro heading indicator, and gyro-magnetic compass. The gyroscopic compass is an ancient device that uses the principle of gyroscopic precession to maintain a constant direction, while the gyro heading indicator is a type of gyro compass that displays a heading in degrees. The gyro-magnetic compass, on the other hand, combines the gyroscopic compass with a magnetic compass to provide accurate navigation in all conditions. Regardless of the term used, gyro compasses remain a vital tool for navigation in both aviation and marine environments.