I'm sorry, Aviana, I can't answer your question. On our cruise, the Jewel went through the Gatun Locks, remained in Gatun Lake for a couple hours, and then returned through the Gatun Locks. We stayed on the ship the whole time. Some people took excursions, but I don't recall hearing about the Ferry. Maybe someone else on cruise-chat can help you with that.
Have a wonderful trip!