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Decal: Short for "Decalomania", a trademarked and patented WATER-SLIDE transfer system. Decals are the really thin "papers" that you place in water and then stick on model airplanes and the like. They're also used for tamper-proof stickers, because they are easily damaged.
On a boat, you wants VINYL SIGNAGE, aka vinyl graphics, aka "stickers", not decals. If you web search "Vinyl boat names/signs" you'll find hundreds of shops offering them including almost every chandlery.
And your local yellow pages will turn up more.
A premium exterior/marine grade vinyl, from 3M or Gerber or a few other brand names, will have a 5-7 year warranty. Cheap stuff from cheap shops is often semi-transparent and doesn't weather well, so don't skimp on the vinyl itself.