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Sorry I misunderstood your earlier suggestion re. +50 feet and was trying to adopt a 'safety-first' approach given that a conventional 'old out, new in' update process necessarily means that we cannot compare old with new - or the MDA as was with the DA as now is.
The absence of explanatory material has not helped.
Out of interest which websites would you (and others are welcome to contribute) recommend as essential reading for (a) professional helicopter pilot, (b) helicopter instructor and (c) sim instructor.
Will be interesting to see what comes out of the woodwork.
G.