Taiwan GPS chip provider Skytraq is working on an Arduino-like board with additional GNSS, GLONASS, Beidoo position capability.
http://www.indiegogo.com/projects/navspark-arduino-compatible-with-gps-gnss-receiver
If you buy and use the Arduino board(UNO, Nano...), you will feel the GPS function is provided as free!!
Want to get centimeter position accuracy ? there is a carrier-phase raw measurement kit provided. You can do a post-processing with RTKLIB to get that position accuracy.
Satellite Constellation
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