GPS accuracy/deviation scaling
As far as GPS accuracy is concerned, it says in the FMS manual (Collins 3000) of my a/c that the following criteria must be met: 4 NM oceanic/remote, 2 NM en route, 1 NM terminal and 0.3 NM final approach. Then, in another booklet by Rockwell Collins, the enroute accuray to be met is 5 miles. I found the same information in the CAA Cap 773. There is nothing specific mentioned like P-RNAV or a certain RNP value required in the three sources I mentioned. Any inputs?