WannaBeBiggles wrote...
Slight topic drift, but does anyone know the difference between a C145[a] and a C146[a] unit?
TSO C-145 is intended for aircraft that have a Flight Management Computer. TSO C-146 is the stand-alone version for everyone else. The version of C-146 equipment that I've seen to date (i.e. just one) include ILS receivers and VHF/COM transceivers, to make them suitable as a complete change of nav/com system in non-FMC-equipped aircraft.