Hello,i'm from Viet Nam
Now i'm using GPS et333
do u can explain for me the meaning (in GPGGA):
- position fix indicator
- hdop
-checksum
-how to know the acurate of GPS's signal

Please see:

 http://aprs.gids.nl/nmea/#gga

 http://en.wikipedia.org/wiki/Dilution_of_precision_%28GPS%29

David
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