Hi all! I am installing a timing GPS unit over a new location where I already have a NMEA GPS with PPS (let's call it unit A). The NMEA GPS is logging every 16 seconds its GPGGA string.
I have a log with around 213400 samples. Each line is similar to this one 55817 48494.500 127.127.20.0 $GPGGA,132814.000,4055.2142,N,00829.6071,W,2,9,1.06,278.9,M,51.2,M,0000,0000*4E I averaged the minutes of latitude and longitude, the MSL (278.9) and the Geoid Separation (51.2) and got the following 40º 55.2155' N 8º 29.6044' W (MSL 268.195m and Geoid Separation 51.2m) (for unit A) I entered this location on Google Maps I got a position that is in the middle of a close street (see footer for image; real location is the red dot). I also have another GPS unit (let's call it unit B) that is on the roof and did the same calculations (36500 samples): 40º 55.2228' N 8º 29.6103' W (MSL 262.66m and Geoid Separation 51.7m) (for unit B) When I plot this with Google Maps I get the exact location of the antenna (within 1 meter; see footer for image; real location is the red dot). I am assuming the first unit has some kind of internal error. Or, does Google Maps has an offset? I need this information to enter the precise location in the Oncore UT+ unit I will be using at this location. I will be using the location of unit A. Cheers, Miguel ---- The images available here: http://dl.dropbox.com/u/11210443/GPS%20A.JPG and http://dl.dropbox.com/u/11210443/GPS%20B.JPG. I did not attach these to the message to reduce traffic on the mailing list server. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
