I read in the AIM that WAAS vector modes will provide a linear course width of +/-1NM prior to the FAF and then provide a fixed width of +/-0.3NM to the point where an ILS splay would be 0.3NM and then tapers down to 700 ft total width at the runway threshold.
How smooth is the transition from the 1NM segment to the +/-0.3NM segment? Is it time-based, distance-based, or something else? Is it smooth at all, or is it actually an abrupt change?
Are all manufacturers following a common standard on how these scale transitions work?