isw writes:

You can get vector representations of just about any
place on earth from Open Street Map.

http://www.openstreetmap.org/#map=5/51.500/-0.100

You'll have to do some work to figure out how to get
what you need, but it's probably the best
open-source map data that's available.

I found the following packs by searching for
"openstreetmap":

p openstreetmap-carto - Setup for standard OpenStreetMap Mapnik styl
p openstreetmap-carto-common - standard OpenStreetMap Mapnik stylesheet
i openstreetmap-client - OpenStreetMap client for the GNOME Desktop
p openstreetmap-map-icons-classic - Collection of map icons (classic set)
p openstreetmap-map-icons-scalable - Collection of map icons (scalable set)
p openstreetmap-map-icons-square - Collection of map icons (square set)

openstreetmap-client is all GUI. Might as well use
Google Earth.

Or do you mean I should use the data with GMT?

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