The GPS module SiRFStarIII receives every two output position data, usually $GPRMC data format data, including latitude, longitude for purpose, speed (knots), direction of motion Angle, year, month, hour, minute, second, millisecond, location data is valid or invalid, and other important information. The statement format is as follows:

　　$GPRMC，，，，，，，，，，，，*, HH

　　Only need to know the location information, so in reading unique, can be practically applied.

　　<1> : Local time represents UTC. Format "when per minute, hour, minute and second 2.

　　<2> : The job represents the country." "Show data available, 'V' for alert accepted, no data available.

　　<3> : represents latitude data. "Sub-level format. Points and points."

　　<4> : "N" or "S" represented by the latitudinal hemisphere.

　　<5> : represents longitude data. The format and LD

　　The status quo. Degree of minutes. Sub - sub - sub - sub."

　　The software reads latitude and longitude data to obtain the user's location to stop the analysis and determine the user's specific location in the area to establish peace. The method is to determine the latitude and longitude of the center based on the user's Settings and calculate the latitude and longitude of the activity to maintain the current object beyond the predefined radius of the peace activity. The results are based on discrimination and the corresponding signs are set.

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GPS position difference principle