Ok, I'm kinda new to the area of mapping and there's a few things I don't really understand.

1) What's Tiger data? (I've heard talk of it before but don't know what it is)
2) Geocoder? I googled and it looks like it gets lat & long for an addr (or did I find the wrong thing?)

As far as providing GPSapp with the data it needs to display vector-based maps, can't we already do that with USGS data?
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--The Amigo