Hurryup&wait:
It’s a bit too late for him now however I take a different view to the others.In similar situations when my 24/45 is already completed and if I can get onto the ferry using two interruptions totaling less that one hour then I set the tacho accorgingly and my Day/Week doesn’t start until I drive off on the other side.
From disembarking the ferry I now have 6 x 24 hours (144) maximum before I must commence my next weekly rest.
No control has had a problem so far.
Ferry mode can be used to split a daily rest period, but not a weekly rest period so your 144 hours starts as soon as you start your weeks driving. The only way around this would be if the ferry crossing was at least 24 hours long.