Good find! That appears to sum up the issue.
I believe recent changes have gone from 400 foot at 4.5nm to 500 feet at 5nm, but that may be only working with coded procedures, and the mode changes to the sloped TCF when crossing the coded FAF.
For the survey, yes, a very detailed survey database is required, with terrain, canopy, and obstacle additives, culminating with a ground and flight validation.
Last edited by underfire; 20th Sep 2013 at 16:27.