Personally, I think "seaworthy" is a relative term. A sailboat that is seaworthy on a lake might not necessarily be seaworthy crossing the North Atlantic. I know that doesn't help much, but I think it probably boils down to whether or not a sailboat is capable of handling the sea conditions most likely to exist where (and when) you intend to sail.
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The first civilization that invented the sailboat was the Sumerians.
It is a type of sailboat commonly used in the Emirates.
The first sailboat is in the picture frame. The second is in the spider web northwest of the five flags. The last one is in the bottom of the right sail in the rafter.
it was around 1300BC and it was made in mesopotamia.
It was an indication that "These ships belong to Spain.".