STA-21G converter unit is intended for converting analog synchro signals (pitch, roll and heading) into a digital data format and generating GPS parameters (latitude, longitude, altitude, speed and course).

STA-21G transmits digitised position angles together with a GPS parameters via the RS-422 serial line and the ARINC-429 serial line (optional).

STA-21G converter unit is specifically designed as a compact unit to fit in a small space on aircraft where space requirements for installation are very tight.