Gspot, the descent from MDA could be a matter of interpretation. The Canadian AIP says..."and remain at the circling MDA until a normal landing is assured." We always took that to mean intercept the final approach at the MDA.
Daytrader, I once did an IR renewal in very gusty conditions. After adding the gust factor, the inspector insisted the new airspeed would change our category from B to C, thus the higher circling limits would apply.
Max Angle, in this country, anyway, it's less a can of worms than you may think. The Canadian AIP says:
The pilot may have to conduct a missed approach after starting visual manoeuvers.
There are no standard procedures in this situation. Thus, unless the pilot is familiar with the terrain, it is recommended that:
(a) a climb be initiated;
(b) the aircraft be turned toward the center of the aerodrome; and
(c) the aircraft be established, as closely as possible, in the missed approach procedure published for the instrument approach procedure just completed.
[This message has been edited by pigboat (edited 28 June 2001).]