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Basically I’m wanting to create a GPS system for my car that works offline, but I’m just a hobbyist and doing this for fun, so I don’t have a ton of money to invest. Are there open databases I can use for the data (roads, speed limits, etc), or is it just impossible to do?
There’s http://www.openstreetmap.org/, which aims to be a free mapping database. It is far from complete, but as a starting point it might fit. Look at their wiki: http://wiki.openstreetmap.org/wiki/Main_Page