A.航向線與風中航跡向的夾角 B.風中航跡線與推算航跡線的夾角 C.航向線與推算航跡線的夾角 D.A或B
A.航向線上 B.流中航跡線上 C.計劃航跡線上 D.A和B均可
A.0.87nmile B.1.7nmile C.7/2nmile D.3/4nmile