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Posted by:dragorn
Subject:GPS Speed=0.0000 problem maybe solved.
Date:20:24:06 11/04/2010

> update:
>
> i took a look at gpspipe while driving and found out my gps is reporting our velocity in m/s.
>
> kismet thinks its unit is knots, so it multiplies the value with that 0.514 factor, which gives that weird speed results as mentioned in the original post.
> after commenting out this factor, kismet client finally shows the correct speed, in m/s (but displayed as m/hr, however i couldnt care less, the value itself is correct :o))
> to get km/h, for now i add *3.6 as a new factor, where it was multiplied by 0.514 before

So that's odd.

So the NMEA spec sends speed-over-ground in knots.

Various versions of gpsd have sent this in meters/sec OR knots (and theres no real way to know other than looking at the gpsd version), which Kismet tries to identify.

I'm not sure what you're sending it with gpspipe.

-m


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