Something to share with u guys.... a bit off topic here hahahaha
Okay.... i just found that we can reprogram GM-2 GPS become military spec.... accuracy from 12" to 2.5 meter..
1st get a iBlue GM-2 (not china GM-2)
Download GPSview 1.2.1 to program your GPS to 5hz
Note Garmin do not work on this unit if the baudrate is higher than 38600. The higher frequency the smoother it goes...
Connect the GM-2 and install the driver....
Fire up the GPSview
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Follow the settings above
All is in $GP
GLL - Lat/Lon data
ZDA - Date and Time
GGA - Satellite Fix information
MCHN is a MTK NMEA sentence which shows the internal status of gps channels
GSA - Overall Satellite data
RMC - recommended minimum data for gps
VTG - Vector track an Speed over the Ground
The setting 1-5 is the frequency of data in sec. some set 5 some set 1 this is because i dont want to overload the data to RS232. Now the duty cycle should be 82%... dont try to push it to 100% else u will have a 232 crash and you have to recover the GPS using others software to init back the bootloader.
After setting.... click on the DGPS apply.. you will get WAAS Enabled....
WAAS is a GPS assistant which provide more accurate signal even indoor.
Follow all the settings above and click apply.
After u program it correctly, u should able to receive GPS indoor. (depends)
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GOOD LUCK
MXsteven