Thank for your great hints from the practical point of view!
I have another question concerning the appliance of the wake vortex separations:
When will the wake vortex separation be used? The manual of the German air traffic control says the follwing:
"...
328.3 The [wake vortex] separation minima mentioned above do not need to be applied, if :
-.31 the pilot of an aircraft has declared that he has the preceding aircraft in
sight and will attend to an appropriate distance himself;
- .32 the pilot of an aircraft renounces wake turbulence separation;
- .33 the area within which wake turbulence is expected will not be penetrated.”
Does this mean that in bad weather conditions (IMC) the wake vortex separation has to be applied always, under VMC the separations don't have to be? Is it the more frequent case that WVS is not in use?