Another great project in the area of DIY GPS is http://gnss-sdr.org/project http://gnss-sdr.org/project It implements a GNSS/GPS receiver using software define

Another great project in the area of DIY GPS is http://gnss-sdr.org/project http://gnss-sdr.org/project It implements a GNSS/GPS receiver using software defined radio (SDR). They also support the RTL2832U based SDR (http://www.rtlsdr.org/ http://www.rtlsdr.org/), which is a cheap way to get started.