>Hi,
>
>I am looking for a map capability to provide me with longitude and latitude in a level of street blocks.
>I need to locate a news rack on the street based on that. An address does not really works well. Since it is located in side walk. A map that can read also a dbf format, so I can zoom right in, based
>on some data linked into the map. That may work also with a GPS unit that can be accurate between 3 to 15 feet.
>

I don't have any detailed recommendation, but I don't think you'll find commercial GPS hardware with the desired resolution - that's better than most of the military GPS hardware.