Content, such as audio or video content, is streamed to portable devices based on an entitlement determination that includes determining the location of the portable device and whether the content is subject to blackout restrictions. Grooves are recessed on an outer peripheral surface of an outer race in a bearing. The imaging unit performs magnetic resonance imaging of an object involving the application of the prepulse. The simplified error signals thus avoid complex calculations of waveform errors, such as least mean square calculations. One pilot will have to operate the control with the left hand, while the other may use their right hand.