30 40 50 60 70 80 90 30.0 29.9 29.8 Figure 13-13. Level turn. Figure 13-12. Global positioning system (GPS). When a turn must be made, the pilot should anticipate and  cope with the relative instability of the roll axis. The smallest  practical bank angle should be used—in any case no more  than 10° bank angle.  [Figure 13-13]  A shallow bank takes  very little vertical lift from the wings, resulting in little if  any deviation in altitude, and the WSC aircraft can continue  to be flown at trim speed. It may be helpful to turn 90° and  then reduce the bank and return to level flight. This process  may relieve the progressive overbanking that often results  from prolonged turns. Repeat the process twice until heading  in the opposite direction of entry in order to exit. Once on  the proper heading to exit the IMC conditions, maintain this  heading until obtaining visual reference with the surface. Turns with a magnetic compass or a GPS would be similar  but the only indication of bank angle is the rate at which the  compass or GPS is rotating. The rotation should be slow and  steady and not increase in speed. Any increase in compass  or GPS rotation should be slowed by decreasing the bank  back to level flight to avoid increasing the bank. Practicing  gentle turns and observing the rotational speed of the compass  and GPS under VFR conditions will help a pilot recognize  an acceptable rotational speed flying at trim speed should  need ever arise. 13-19