Collecting helm potentiometer to measure instrument, using of relay array to control precision power supply to test helm potentiometer. and then deciding helm potentiometer is up to standard or not.

Digital servo-control technology based on DSP and CPLD is used to solve airborne application problems of optical-electronic sensor: isolating vibration of airplane and tracking pilot helm.

The Marine autopilot receives signals from directional sensors such as the gyrocompass and USES them to automatically control the helm for navigation.