The normal users only uses some basic information for their location, the GPS receivers sends many other data that are useful for experts users. With a commercial receiver from Royaltek, a Bluetooth transmitter and Matlab mathematical software, we've created a series of functions for extracting raw data from the receiver and for check the correct interpretation and conversion. The objective is the users could get this data as from low-cost receiver. In this this project will find a brief summary of the GPS system, explanations on the operation or structure of the SiRF protocols, you will also find a small descriptive guide to the transmission of data from the GPS system, that's is important to get interoperability between SIRF protocol with the GPS frames. Also provides an experiment to show the use of such routines in an academic and as a foundation on which to base future work and develop or improve the applications that employ.