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List:       gpsd-users
Subject:    Re: [Gpsd-users] Invalid speed figures
From:       Charles Curley <charlescurley () charlescurley ! com>
Date:       2011-02-28 23:35:43
Message-ID: 20110228163543.3326bc0c () yendi
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On Mon, 28 Feb 2011 22:27:42 -0000 (UTC)
"Derek C" <derekgpsd@hssl.ie> wrote:

> 
> Hi all,
> 
> I'm using gpsd in a vehicle tracking project (OpenWRT is the base
> O/S).  I actually have two separate programs connecting to GPSd and
> receiving position updates - one is for per-second updates and the
> second program takes every 10th position and sends it for storage.

I take it these are your programs.

> 
> A couple of times now I've seen GPSd go funny and output invalid
> speeds (mumbo-jumbo figures - as if it were returning a random memory
> location). When this happens all other details are good (lat, lng,
> course, alt).
> 
> When gpsd is restarted its fixed.
> 
> Has anyone else seen this type of thing happen?

I have not seen anything like this with speed, but I've seen a second
cousin with time. Is the GPS receiver by any chance disconnected at any
time between the reasonable speeds and the bogus ones?

It would help greatly if we knew the version of gpsd you are working
with, and where you got it: tarball, git repo, distribution repo, etc.

Also, you may find the troubleshooting page useful, 
http://gpsd.berlios.de/troubleshooting.html.

-- 

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