If I'm not mistaken, you purchased Cornings Pyroceram plates.
Unless the technology has changed since I've used it, in the foodservice industry, I would not want this stuff on my boat.
While it's true, that pyroceram is durable and micro-wavable when this stuff does break it shatters, almost explodes into a million pieces of very sharp chards. I would recommend you leave this stuff at home, and find some nice plastic ware. If you are against using plastic, then I think you are better off with a traditional china plate with a clay bisque that is glazed. China will break and chip but not shatter like the pyroceram.