OpenStreetMap is an optional feature that may not be available. An OpenStreetMap layer requires Internet connectivity. Other map display operations do not require Internet.
Levels Viewer, 1, 2, 3
OSM Gallery views ... http://proximityone.com/cv_osm_apps.htm
Kansas City, MO ... shapefile layers superimposed on MapQuest OSM
ZIP Codes (red boundary); intersection to intersection streets
Identify tool (see pointer) used to profile a street segment; profile shows 4600 block of Madison Ave