Yes, You are likely correct. However we have no info on the Concordia radio system [no reports] so it's hard to tell if it would have been decoded by any hobbyists/scannists as some of the systems are MotoTRBO.
As for the Crown Princess they use a 5+ Channel radio System in the UHF Business Band or what is sometimes call the UHF Marine channels.
Yes, there is actually atleast 3 Rptrs on the CP
Yes, like listening to your Police or Fire, you only need to listen to the Output of the Repeater to hear both sides of the conversation
Don't ignore the VHF Channels too, many of the cruise lines also use VHF marine channels for the Shore Excursions and coordination with the Port Agent/Pilots etc
PM me with your Travel Date, and I can likely tell you what other ships you will encounter on your trip.
Also the best part is to listen when getting ready to depart a port, and they are announcing the folks who are LATE
Due to the recent Costa Cruise Ship disaster in Italy, I'm positive some very important communications were spoken over their radios without the passengers knowledge. In the past I have never had the urge to take my handheld scanner on a vacation, however, that will change. In April I will be on the Crown Princess. I researched the ships frequencies and they appear to be UHF simplex and repeater. Does the ship actually have a repeater system on-board? If so, do you simply program in the repeater frequency to receive both sides of the conversation? I would certainly appreciate any advice provided. Tony