11E, you could at least indicate whether the helicopters are visible from the outside or whether they are locked up in a hangar before transfer to an SDDC vessel. At Steinweg Handelsveem it used to be a good practice to park helicopters inside for a while before transfer. I am also very much interested when the helicopters were noted. This information will at least give us a change to make a proper decision about driving to Rotterdam to have a try.
One more thing: the harbour number might be too specific to you because of the reasons stated. To me the numbers of the helicopters seem to be very specific as well