The Organic Maps app is experimenting with public transport support, introducing the GTFS feature in addition to the existing OSM transit data. By following specific steps to download, prepare, and merge GTFS data from sources like Transitland and OpenMobilityData, users can access proper public transport navigation with optimal routes and improved visual representation. The experimental nature of this feature lies in its lack of thorough testing and user interface refinement. Although collisions between OSM and GTFS data may occur, the app filters out conflicting subway data to provide a seamless experience. For those interested in trying out this new feature, detailed instructions are provided for activating full public transport support.
https://github.com/organicmaps/organicmaps/blob/master/docs/EXPERIMENTAL_PUBLIC_TRANSPORT_SUPPORT.md