Quick reply...

Hey... That's an excellent idea... Though a village on the Moon is more realistic...

Question: would GPS positioning work in space? That's a two-fold question: will the hardware be able to hear the signals over such a distance (Earth-to-Moon or Earth-to-Mars), and will the software be able to process it properly (or was it programmed for on-Earth positioning?).

[Edit]
Navigation on the Moon on a weak signal from the GNSS
http://mapstor.com/news/digital-cart...-the-moon.html
http://porto.polito.it/2524884/
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Related question: which navigation software would be able to use this GPS position for on-Moon or on-Mars navigation - show you the maps, and such?

Oh, and do not forget the Moon dust! It's worse than sand. So, you need a very good dust tight case for N900 ;-)

And Mars is hot, I expect. Sooo... Space-preparedness is an interesting topic. A challenging one :-)

Best wishes. Thank you.
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Per aspera ad astra...