Carnival Cruise
Our family had a Carnival cruise planned for Thanksgiving week leaving from Long Beach. Hoping to log some contacts, I planned on bringing both my portable HF and handheld VHF/UHF radios, with various antenna configurations.
I checked the Carnival website and verified that not only are ham radios allowed on the ship, but they could be used. I also read some blogs of others who had taken their radios aboard. Their only recommendation was that you speak with the captain to explain what your plans were and to discuss any issues the captain may have with your plan.