In order to achieve the rough northseeking in large azimuth, the motion characteristics of pendulous gyroscopes in both nontracking state and tracking state in large azimuth are analyzed respectively. Then based on the motion characteristics of gyroscopes, two rough northseeking methods are put forward and analyzed in nontracking state and tracking state. Finally, the experiment on the rough northseeking method in tracking state is carried out. The results demonstrate the feasibility of the method and the reasons of low precision are analyzed. The necessity of designing highprecision servos system is presented on basis of the results.