Open Street Map, is a FOSS version of an internet based map… (ala Google Maps). OpenStreetMap is a free editable map of the whole world.
OpenStreetMap allows you to view, edit and use geographical data in a collaborative way from anywhere on Earth.
A quick examination showed my region of the globe, without any issues, and I was able to zoom in down to street level, and didn’t notice any obvious issues….
And it’s darn responsive….