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I would like to have a USB that I can bring with me to any computer. That USB should hold a map server, so that the client computer wont need internet and avoid using OSM or Google maps or any other online map service. I have another portable application that requests a WMS service to load maps, but i would like to direct that import to my local USB map/WMS server. Is PortableGIS the solution? I am using PortableGIS for QGIS and that works fine. However I cant find any documentation...

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Which OS will you plug the USB ken in? Do you need it to be cross platform? – Devdatta Tengshe Nov 4 '12 at 13:17
possible duplicate of Offline tiled map web app – Devdatta Tengshe Nov 4 '12 at 13:19
Which client software would consume the WMS? Wouldn't it be easier maybe to just transport a QGIS project with all its data files? – underdark Nov 4 '12 at 16:37

Consider OSGEO Live (Xubuntu) with USB bootable:

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I just came across this tool last week:

it is a fully featured, self hosted WxS service based on mapserver and python mapscript. It does not require a web server because it has one embedded.

As long as you Python-fu is strong it should not be too hard to set it up so that it can run from an USB key (even on Windows).

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I have previously done this with MS4W, though this only works on Windows

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