Open Maps
@AC
Were you thinking of OpenStreetMap?
It's already usable in a browser (you can even switch on its GPS location facility). There are several apps which purport to make it even easier to use, although most of them are commercial offerings which mess with the rendering in order to make themselves distinctive, but may give you downloadable maps for offline use (if you pay). Some offer other half-working, half-baked features too.
Just point your browser at http://osm.org. First time you use it you get a lot of gumph, but that goes away on subsequent uses (unless you delete the cookies). Search for a location and away you go. Quality of details varies from place to place, depending on whether or not somebody has bothered to add things to the map.
Biting the hand that feeds IT
