Positioning precision of fiber optic gyro (FOG) fixed attitude heading reference system POS310 using closed-loop optic gyro (FOG) and high precision quartz flexible acceleration meter, and professional GNSS board combination, the number of GNSS / INS specially designed according to the fusion processing software, to provide accurate location information (latitude, longitude, and altitude) and attitude (pitch, roll and yaw), and 3D acceleration and angular speed dynamic information, is a moderate accuracy (tactical) positioning and attitude determination system. Scalable multi-sensor (odometer, barometric height meter, etc.) in order to improve the accuracy and applicability of the system, which is widely used to move the measuring maps, aerial photogrammetry, ship attitude dynamic measurement field.