An OBF file is a data file used by OsmAnd, a GPS navigation application for Android devices. It is saved in the OBF format and stores map data, which may include the placement of roads, buildings, natural objects, and walking, hiking, and biking paths. OBF files enable OsmAnd to render, route, and search maps when offline.

You can create OBF files using OsmAndMapCreator, which allows you to create map data files from .OSM data files that can be used offline. You can also download OBF files created by other OsmAnd users. You cannot open OBF files directly in OsmAnd or OsmAnd+. The files must be placed in the application data directory in Android: OsmAnd - storage/Android/data/net.osmand/files OsmAnd+ - storage/Android/data/net.osmand.plus/files