Here is what Apostleship of the Sea website says are the duties and what is included/not included for a participating priest:
Cruise Ship Priest Program
Basic Services provided by the Cruise Ship Priest:
Daily Mass for Cruise Passengers
Weekly Mass for the crew
Ecumenical or Interfaith services for non-Catholic Passengers
Pastoral care and visitation to the in-firmed for all passengers and crew
Other religious and spiritual responsibilities as requested
The priest receives his room and basic meals courtesy of the cruise line. However, he also pays gratuities, purchases excursions, and buys items onboard.
AOS-USA appreciates our Priests’ service onboard for the Spiritual and Pastoral Care of the People of the Sea. Once you are an AOS-USA Cruise Ship Priest, yours is NOT a “free cruise”. You are onboard for service and ministry. This is a unique ministry of the Catholic Church, and one which we take seriously.