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[aprssig] The best resolution of position from APRS (expiremnt two)

Tapio Sokura oh2kku at iki.fi
Wed Jan 4 16:21:53 UTC 2006


Andrew Rich wrote:
> $GPRMC,154456,V,2734.4576,S,15306.2202,E,0.0,0.0,040106,11.0,E,S*36
> $GPRMC,154456,V,2734.4577,S,15306.2202,E,0.0,0.0,040106,11.0,E,S*36 (added
> one to this pos S)
> 
> Now I am assuming this is
> 
> 27 deg 34 minutes 45.76 Seconds ? and
> 27 deg 34 minutes 45.77 Seconds ?

You are assuming wrong. NMEA carries the position always in integer 
degrees and decimal minutes. So you have 27 degrees 34.4576 minutes and 
27 degrees 34.4577 minutes. Because one minute is 1852 meters, 0.0001 
minutes (N/S direction) is a bit under 20 cm.

   Tapio




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