Python source: Copyright IOES-Lab. Licensed under Apache-2.0.
The bundled Natural Earth 1:10 million coastline is public domain. Its source URL and SHA-256 are in src/posim_routing/data/coastline-source.json. It discovers nearby coastal regions; it does not establish depth or collision clearance. See Natural Earth terms.
Global routes use the separately installed searoute package and its Eurostat maritime graph. Retain its license and attribution when distributing it. OSM land polygon inputs to port connectors are subject to ODbL; see OpenStreetMap copyright.