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For all CAT II / CAT III approaches, Aerodrome Operating Minima are expressed as a minimum DH and RVR. These Aerodrome Operating Minima must be established by the operator, as specified in the following extract of ICAO Annex 6. For related definitions concerning the Minima, refer also to paragraph 2.8 above.
An operator shall establish aerodrome operating minima for each aerodrome planned to be used. The method of determination of such minima must be approved by his authority. Except specific authorization, these minima shall be higher than any that may be established for such aerodromes by the state in which the aerodrome is located.
An operator must take account of:
- the type, performance and handling characteristics of the aeroplane.
- 
The composition of the flight crew, their competence and experience.

- 
The dimensions and characteristics of the runway which may be selected for use.

- 
The adequacy and performance of the available visual and non-visual aids.

- 
The equipment available on the aeroplane for the purpose of navigation and/or control of the flight path, as appropriate, during the approach, the flare, the landing and the missed approach.

- 
The obstacles in the approach and missed approach areas and necessary clearance.

- 
The obstacle clearance altitude/height for the instrument approach procedures.

- 
The means to determine and report meteorological conditions.

Extract of ICAO annex 6
To establish the decision height, the operator must follow the rules explained in the two paragraphs 3.2.2 (DH CAT II) and 3.2.3 (DH CAT III).
To establish the acceptable RVR minima, reference should be made to figures 3.5, 3.6,
3.7 or 3.8 provided here below. However, each operator must refer to his national authority on this subject.
3.2.2 DETERMINATION OF THE DH FOR CATEGORY II
To establish a DH for a particular Category II operation, an operator must take into account five parameters as explained in this extract of the JAR-OPS.
An operator must ensure that the decision height for a Category II operation is not lower than:
1.  
The minimum decision height specified in the AFM.

2.  
The minimum decision height to which the precision approach aid can be used solely by reference to instruments.

3.  
The OCH for the category of aeroplane.

4.  
The decision height to which the flight crew is authorized to operate.

5. 
 100ft (30m).

Extract of JAR-OPS
Additional information
In 1 above, for all Airbus aircraft with Category II certification, the minimum DH
specified in the AFM is 100ft.
In 2 above, the minimum DH is related to the ILS ground installation performance.
In 3 above, the definition of the OCH can be found in the Chapter 5.6.
　
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