Firstly, and most importantly, I take "interdenominational" very seriously. For most of my ministry I have worked ecumenically, so I try to bring to worship a sense of Christian community that transcends denominational boundaries. The liturgies I use have been devised from a range of resources, including the United Church of Canada where I have worshipped over several years. Sometimes new hymns and liturgy help to refresh our worship.
Worship on a cruise ship must not become burdensome or appear obligatory to passengers, who are actually on holiday. So my pattern is a short Morning Prayers on sea days and an ecumenical Holy Communion service on Sundays. Other "special" services are slotted in where appropriate.
All worship is on-screen using PowerPoint, for several reasons:
Services on Sundays and special dayshere. The great majority can be found in HymnQuest, but some can only be copied with the full Copyright Licence Users' Edition.