If you have a Moby or Toremar ticket marked PARTI PRIMA you can safely board, subject to availability, one of the company's ferries present. The same applies to Blu Navy tickets that have the PARTI PRIMA OR DOPO option, in which case the ticket is active for all departures on the same day made by the same company and, again subject to availability, you Iwill be able to safely board one of the ferries with a different schedule.