Cougar operates Lower Than Standard at St.John's NL and Halifax NS. Flights are routinely flown to DH of 100' (RadAlt) and RVR600. To fly the Cat II the operators has to be authorized by Transport Canada in their AOC and then all pilots have to be trained and flight checked to LTS standards. The airport has to have a CatII/III system in place with associated equipment. The aircraft must be able to be capable of flying it and have the appropriate equipment. When the airport declares they are in Low Vis ops, then there are also restricted movements on the aeodrome taxiways and aprons. Its a pretty big deal and expense to go to these operations for those few days that require it. Busy airports will have it and those that are affected by weather like St.John's will have it. For offshore, GPS approaches LPV, and radar will give the operator as low as one really wants to go, short of a tractor beam!