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I have decided to play in the world of GPS modules. I have read the GPS Buying Guide from Sparkfun, but still am not sure which unit I want to go with. I am leaning toward the LS20031, do any of you have any experience with GPS modules? Any advice you would like to add to the chiphacker community?

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    \$\begingroup\$ might want to give a bit more info on your application ? \$\endgroup\$
    – jeremy
    Commented Jun 6, 2010 at 3:55
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    \$\begingroup\$ Mostly just curiosity. I know many of our students have had issues finding one that can get a lock inside a building. I know buildings are difficult to get locks in, but my Garmin GPS is able to get a lock in the same room. So, not looking for high accuracy or refresh rate, just something that can have reception that is about the same as commercial products. \$\endgroup\$
    – Kellenjb
    Commented Jun 6, 2010 at 17:41

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I recently purchased a couple of GPS modules for a project I'm working on. You didn't specifically mention Arduino, but I bought the GPS logger shield from Adafruit with an EM-406a module. I'm not using an Arduino, but I figured it was a compact solution that had two things I wanted (GPS and removable storage). The EM-406a had no problems getting a satellite lock inside my office. I also got the Copernicus DIP Module from Sparkfun so I could breadboard with it. No problems so far - just read the datasheet and remember to pull XRESET and XSTANDBY high.

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    \$\begingroup\$ Glad to hear that you were able to get a lock inside your office. I am going to look into these. I actually use PICs and MSP430s. Around this community it seems as though many people use Arduinos. \$\endgroup\$
    – Kellenjb
    Commented Jun 7, 2010 at 14:51
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u-blox makes the best ones, but they are expensive. They are used by the military and government agencies because of their performance. I didn't have any problems with one of their modules on a home-made PCB, interfaced to a 16F88 PIC. It works indoors.

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There's lots of detail about building a GPS to SD Card Logger here. It uses a PIC but you may be able to make alterations as you want.

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