View Single Post
  #12  
Old April 13th 10, 05:11 PM posted to rec.skiing.snowboard
Christian G. Becker[_2_]
external usenet poster
 
Posts: 4
Default how fast do you go?

Am 05.04.2010 17:09, schrieb Bob F:
Christian G. Becker wrote:
Am 05.03.2010 23:49, schrieb Mike M. Miskulin:
hey now - any one ever had their speed reliably measured?


I have a GPS-logger with display and speed-measuring. Got 75 km/h at
two points in the recent winter:
...
I only take the thing out at places where I can keep an eye on the
display, it is rather meant to log the places I've taken photos of on
the slopes. Maybe I'll look into the gathered data, if I can calculate
speeds from it.


My understanding is that short term speed measurments are not very accurate on
GPS's.


That might depend on how "hot" the GPS fixed its first coordinates and
how many satellites it can see. Tested mine several times in a car -
never differed a lot from the cars speed (which has to be calibrated to
show up to 10% + 4 km/h more but never less than actual speed here in
Germany).

Krischan
Ads