I'll hold my own council on the merits of GPS versus 'traditional' navigation but please can some body give me a simple technical explanation (leave your prejudices and opinions behind, I just want science).
Question: Why am I allowed to make an NDB approach with all it's know deficiencies (night effect, weather effect, coast effect etc.) and absolutley no integrity checking (well OK, it has a morse ident.) but I am not allowed to make a non-precision GPS approach with a RAIM certified GPS set?
Am I missing something?