In Canada Category 1 ILS approaches can be flown by rotorcraft to a 100 DH providing the carrier complies with the following conditions:
(19) Lower than Standard Decision Height
Category 1 Instrument Landing System Approach Minima - Reported Visibility RVR 1200' - Decision Height 100'
Authority to conduct approaches to 100' DH with 1200 RVR is subject to approval of a training program using an approved synthetic training device for the helicopter type to be used. The training device shall be capable of depicting IMC to 100' DH.
The training program shall include:
(a) capabilities and limitations of the ILS and visual aids;
(b) operational characteristics and limitations of the airborne system to be used such as the flight director, automatic approach coupler and systems and devices peculiar to the applicants installation such as missed approach guidance and failure warning systems;
(c) individual crew duties including approach briefing, two pilot challenge and response communication rule, pilot incapacitation procedures and pilot monitored approach procedure with emphasis on need to continually monitor flight instruments until attitude and descent path have been visually assessed; and
(d) training in the synthetic training device shall include effects of wind shear and turbulence, recognition and reaction to malfunctions encountered prior to and after reaching the missed approach point, ILS approaches to landings from 100'/1200 RVR conditions and missed approaches during which practical malfunctions and emergencies are introduced.
(18) Lower than Standard Take-off - Weather Minima RVR 600 feet
Authority to conduct 600 RVR take-offs shall be subject to approval of a training program using an approved synthetic training device for the type of helicopter to be used and capable of depicting RVR 600' take-off conditions. Training is required for the pilot-in-command only unless the air operator authorizes the second-in-command to conduct 600 RVR take-offs in which case the second-in-command shall complete the same training.
The training program shall include:
(a) take-off alternate requirements;
(b) one engine inoperative performance requirements;
(c) responsibility for obstacle clearance and visibility requirements;
(d) take-off runway requirements;
(e) helicopter equipment requirements;
(f) pilot qualification requirements; and
(g) training in the synthetic training device shall include normal take-offs under RVR 600' conditions and rejected take-offs under RVR 600' conditions including engine failures and system malfunctions.
http://www.tc.gc.ca/CivilAviation/Regserv/Affairs/cars/Part7/Standards/724h.htm#724h_115