I am quite new to using a FMC, but quite enjoy the learning process.Everytime I go into the FMC IDENT page the message "NAV DATA OUT OF DATE" appears.Do I need to update? If so how?I only purchased PMDG 737NGX two weeks ago.From the IDENT page: NAV DATA: AIRAC-1108, ACTIVE: JUL28AUG24/11, OP PROGRAM 549849-011 (U10.8A).Appreciate any feed back