Map default:
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Drag the point to move it
Drag vertices to reshape
Drag or add waypoints to reroute
Copy and transform this line into a routed track with waypoints, elevation and surface info.
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This map renders the indoor data that is normally invisible on OpenStreetMap, provided by indoor=. Zoom in to a bigger train station for example, and you'll see what is mapped there.
Learn more about how to tag elements in OSM for indoor maps.