air data system and inertial reference system
altitude heading reference system
Attitude and Heading Reference System
Attitude And Heading Reference System Apparatus
attitude heading and position reference system
Attitude Heading Reference System
attitude reference system
automatic heading reference system
automatic position reference system
centralized reference system
Continuous Operation Reference Station System
Continuous Operational Reference System
CORS Continuous Operatinal Reference System
distributed strapdown attitude reference system
distributed strapdown attitude reference system DS
FRS Fundamental Reference System
Geocentric Reference System
Geodetic Reference System