There are also many other uses for a static ship. I've seen one used as party hall (a river boat), one as restaurant (a passenger see ship) and two as a museum (a sailing ship and a fishers ship). So building=ship seems the best solution to me as the building=* tag doesn't imply usage but does imply a certain look of the feature.
A new static_ship=* tag seems overkill to me and causes unwanted redundancy. You'll get tag combos like static_ship=museum amenity=museum or static_ship=restaurant amenity=restaurant And what to do with entrances? A building can have nodes tagged with building=entrance. But if you consider a static ship not as a building, than you need a new entrance tag. And what about refinement? If you want to tag if it's a passenger ship, a river boat or some other type? With the building=* tag, you can use refinement tags like we all know them: building=ship ship=river_boat or building=ship ship=sailing_ship While with the static_ship=* tag, using conventional refinement tags isn't possible.
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