NDB approach tolerances
I quite often find that RMI equipment as fitted to my club' PA 28 is in error by about 10degrees, when compared with the ILS or the final approach track as defined by radar.
In the final stages of the approach, even to minima, a 10 degree error is not a huge problem as the aircraft can be manoeuvred to a landing. However, what is the "fat" that is designed into the approach. How much tolerance do approach designers build into the NDB procedures? I am, of course, concerned with obstacle clearance, primarily.
Bogbeagle