[ gpsdrive ] Miles per hour

[Hamish]

schrieb Paul Martin:
> > One little bug in the new code that uses libgps... it always returns
> > speeds in kph even when you're set to use miles. I had a little
> > surprise yesterday when I first used it in for real since the changes.

Guenther wrote:
> hmm, yes, I had some other changes in my mind when I wrote this part.
> I considered to change the gpsdrive code so that the variables always
> contain metric values, and that the conversion to something else is
> only done when needed for display. this should save some conversions
> during the calculations, I guess...
> 
> comments?

for historical perspective just to note that (like it or not) knots is
the native units of NMEA velocity data and traditional navigation.

whereas the "N" of NMEA stands for National (ie USA; owner of the sats)
whereas the "M" of NMEA stands for Marine (where knots is still king
  worldwide)

now we aren't parsing NMEA anymore, so we are not as tied to knots.


Hamish