WOIAF says explicitly that “they guard their charts jealously and do not share such knowledge,” so no, I don’t think the cartographic knowledge of the Summer Isles is shared with outsiders.
Re the CbC analysis of Arya I, ASOS : Do you believe that level of cartographic knowledge is accurately depicted in the shows Riverlands map given the intercontinental maritime travel of various peoples? There is explicit mention of the ability of the mapmakers of the Summer Isles in the text. In aWoIaF, Yandel states that the explorers of Koj jealously guard their “maps” of Sothoros, possibly indicating that they do share their other charts with outsiders, stimulating cartographic development.
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