I don't own a GPS module, but on my current project I would like to be able to add GPS capabilities later and therefore want to leave the necessary Arduino pins unconnected for now.
I have looked at Ladyada's schematic, and if I'm not mistaken, it only needs three data pins? (CS,MISO,MOSI)
Plus the obvious two power pins.
Is that correct?
Maybe someone who actually owns this board can tell me more 
