It is interesting how the Atlantic Ocean divides opinions here is the definition taken from FAA CFRs
Category IIIA operations, an ILS approach and landing with no decision height (DH), or a DH below 100 feet (30 meters), and controlling runway visual range not less than 700 feet (200 meters).
Category IIIB operations, an ILS approach and landing with no DH, or with a DH below 50 feet (15 meters), and controlling runway visual range less than 700 feet (200 meters), but not less than 150 feet (50 meters)
EU Ops states
Category III operations are subdivided as follows:
(i)
Category IIIA operations. A precision instrument approach and landing using ILS or MLS with:
(A) A decision height lower than 100 ft; and
(B) A runway visual range not less than 200 m.
(ii)
Category IIIB operations. A precision instrument approach and landing using ILS or MLS with:
(A) A decision height lower than 50 ft, or no decision height; and
(B) A runway visual range lower than 200 m but not less than 75 m.
Don't you love semantics
looks like BelArgUSA was right. Another interesting fact that highlights differences in approach to aviation safety is the slow response time for EASA to implement the extension of ETOPS to 3 and 4 engine aircraft which the FAA did last year