as.tile_source          Deprecated interface
has_internet            Check for Internet
osm_native              Coordinate helpers
osm_raster              Load an Open Street Map image
osm_tile                Low-level tile math
osm_tile_covering       Get an OSM tile covering
osm_url                 Resolve a tile into a URL
osm_url_load_async      Load tile URLs
osm_url_spec            Tile URL Specification
set_default_cachedir    Set/Get the Default Tile Cache Location
