Genghis the Engineer, the idea is to add credibility to the IR(R), so that it cannot be thought of as an IR-by-stealth by those who would discredit it.
IMCr holders are NOT assessed to IR minima, which require a faster scan and corrections to be applied more promptly closer to the RW for obvious reasons.
Why the UK AIP lists the IMCr minima as 'advisory' is beyond me. In 40+ years of holding IMC approach qualifications, I'd never come across 'advisory' minima before. Fortunately most, if not all, IMCr pilots are not so stupid as to press on below these limits though.
Last edited by BEagle; 28th October 2013 at 14:29.