I don't know. But I'd suggest you not put any magnets out there, even if they are. Generally speaking, you're not supposed to leave things on the verandahs that aren't already there.
Yeah-I wouldn't chance it. The forward speed of the ship plus the wind. Your magnets are going to end up in the drink or worse ingested by some poor sea creature.
My initial gut feeling was that they would fly off into the ocean too. However, if they are really secure magnets, they might be fine. I have WDW and Universal Orlando Annual Pass magnets on the metal body of my scooter, which is the front facia below the handle bars and the sides around the engine under the seat. It's 300cc, and I can do 70-80 mph on the highway. I haven't lost a magnet that way yet. They have been stolen by people though The magnet displays that they sell in the gift shops and on CC are pretty large and secure. They would also need to be flat.
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