Are cabins mandatory on overnight sailings?

Cabins on some overnight sailings are mandatory such as on our Kiel - Gothenburg and Harwich - Hook of Holland routes.  Mandatory cabins must be booked at the time of booking.

On certain overnight sailings, such as on our Rosslare - Cherbourg route, it is mandatory to select either a cabin, a reclining seat or the option to travel without a cabin or seat.