JM - What the f*ck are JCP and CBA?
For my money they can rip out all the NDBs tomorrow. I fly one NDB approach a year - a ceremonial part of my CIR renewal. If I ever needed to fly one in anger I would do it as a GPS overlay approach anyway and just monitor the NDB needle - far safer than chasing that little needle around. If the ADF in the Bo plays up - it will be replaced by another TSOd GPS.
The only ground based navaid that is required is the ILS, cause those in control seem to be too stupid to go with WAAS in this country. Maybe a case can be made for keeping VORs - but I never use them so it is not an issue for me.
What is required is widespread VHF coverage - down to circuit height at every licenced aerodrome and on the ground everywhere RPT goes.
Dr 