As the pilot becomes experienced in performing turns  around a point and has a good understanding of the effects  of wind drift and varying the bank angle and wind correction  angle as required, entry into the maneuver may be from any  point. When entering the maneuver at a point other than  downwind, however, the radius of the turn should be carefully  selected. Be sure to take into account the wind velocity and  groundspeed so that an excessive bank is not required later  on to maintain the proper ground track. The fl ight instructor  should place particular emphasis on the effect of an incorrect  initial bank.  Ground reference maneuvers and related factors are used  in developing a high degree of pilot skill in analyzing the  effect of wind and other forces acting on the aircraft for  accurate and safe maneuvering of the aircraft. The specifi c  maneuvers are: These are training maneuvers that should be mastered to  within the tolerances in the PTS.  Common errors in the performance of turns around a point  are: • Failure to clear the area adequately. • Failure to establish appropriate bank on entry. • Failure to recognize wind drift. • Inadequate bank angle and/or inadequate wind  correction angle on the downwind portion of the circle,  resulting in drift away from the reference point. • Excessive bank and/or inadequate wind correction  angle on the upwind side of the circle, resulting in  drift towards the reference point. • Gaining or losing altitude. •  Inability to maintain a constant airspeed. • Inadequate visual lookout for other aircraft. • Inability to direct attention outside the aircraft while  maintaining precise aircraft control. • Rectangular course, •  S-turns across a road, and •  Turns about a point. Chapter Summary 9-12