ROG:
Am I correct in saying that the ferry ‘mode’ should be done just before each of the two movements
Yes. You’re sitting on a quey or boat on rest waiting to embark or disembarked. Ferry mode marks the Tacho to indicate that you are going to interupt what you are currently doing, which is resting. Once on board the boat you put the Tacho back on rest… because you are now continuing your rest.
I get 8 boats a week from Ireland to Holland 4 of which usually require a ship movement and have never had problems with VOSA, BAG, the French or anyone else.