With enough trying and patience I haqe been able to enter, activate and execute almost all flight plans. NATW and the lastest one NATX have me completely stumped.  It makes no difference if I Line Select it to the left or right side, I still receive NOT IN DATA BASE. The navigation data base which came with the 767-300 Base is the one dated March-April 2009. Does anyone know what might be the problem?
Thank you.