KnowraPortolan chartLinked fromLinked fromThe 16 pages that link to Portolan chart, each with the reason it gives.All 16Broader topic 5Related 6Narrower topic 3Compared with 2Nautical chartNarrower topic: It is a historical predecessor with a different surveying and mapping tradition.Martin WaldseemüllerNarrower topic: Portolan traditions supplied practical coastal detail alongside scholarly world mapping.Piri ReisNarrower topic: The 1513 map belongs to a chartmaking tradition centered on coasts and sailing routes.