Part Number: 1880920 (Gyroscopic compass system)Part Number: 2587193-4 (Gyroscopic compass system)Part Number: 2587193-5 (Gyroscopic compass system)Part Number: 2587193-6 (Gyroscopic compass system)Part Number: SG-500 (Gyroscopic compass system)Part Number: TYPEC-12 (Gyroscopic compass system)