My GPS-receiver is too good 2

[Håkan Elmqvist]

Another interesting observation is that in the first position delivered by gpspipe the minute fraction is given with 5 decimal digits, all the following with four, se below:

$GPRMC,183705.00,A,5919.26062,N,01758.20746,E,0.019,,150524,,,A*7F
$GPRMC,183706.00,A,5919.2606,N,01758.2075,E,0.0190,,150524,6.4,E*4D
$GPRMC,183706.00,A,5919.2606,N,01758.2074,E,0.0136,167.940,150524,6.4,E*63
$GPRMC,183707.00,A,5919.2606,N,01758.2074,E,0.0136,167.940,150524,6.4,E*62
$GPRMC,183708.00,A,5919.2606,N,01758.2074,E,0.0136,167.940,150524,6.4,E*6D
....
....

Any comment?


As my old GPS-receiver died a quiet death I bought a cheap new one labeled G-MOUSE.
lsusb tells me it is a U-Blox AG [u-blox 7] which is confirmed by dmesg.
Putting the receiver for 5 hours in my garden with a free sky and sending the output of gpspipe -r to a file and filtering the file I see that the indicated position all the time has stayed the same not changing a single digit even if the indicated speed all the time is 0.0724 knots.
My old receiver always wandered around a bit.
Has GNSS become so good and stable or is this some kind of software cosmetics or most probably is there something I haven't understood?

-- 
Håkan Elmqvist
Sunnerdahlsv 7
167 62 Bromma
Telefon: +46 (8) 80 18 81, +46 (704) 56 74 81, +46 (176) 84 077
epost: hakelm@smeden.org

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