The Dax Path tool makes use of @itsdax great web walking API https://github.com/itsdax/Runescape-Web-Walker-Engine All credits to him.
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See instructions in https://github.com/Explv/osrs_map_tiles#generating-tiles
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Test the map to ensure coordinates produced for a selection of OSRS tiles are correct, you can compare with the live version of https://explv.github.io/