DH ceiling and minimums CAT II
We had a discussion between colleagues regarding the items in the title. If the weather report is RVR 550 - OVC 001 the airport is CAT I ?? ( DH not less than 200 ) or CAT II ?? ( less than 200 but not les than 100 ). Taking into account just the visibility, the Airport operates in CAT I but with the Ceiling its will remain CAT I or changes to CAT II? are DH and ceiling the same thing? can the ceiling be lower than the DH? is the ceiling a minimum ? FAA stands in the approach plates "CEILING REQUIRED" but what about ICAO? is there any ICAO regulation or document that clarifies this? thanks in advance.