Andreas,

To get a better idea of what's going on, It might be helpful to take a look
at the obstacle information with rviz, see the following tutorial:
http://www.ros.org/wiki/navigation/Tutorials/Using%20rviz%20with%20the%20Navigation%20Stack

<http://www.ros.org/wiki/navigation/Tutorials/Using%20rviz%20with%20the%20Navigation%20Stack>In
particular, you'll want to look at the plan being created and any obstacles
or unkown space that might block the robot's path.

Hope this helps,

Eitan

On Fri, Sep 3, 2010 at 7:50 AM, Wim Meeussen <meeussen@willowgarage.com>wrote:

> Andreas,
>
> I've seen this problem in the past when the goal you send has an invalid
> quaternion. If you don't specify the orientation of your robot, the
> quaternion message will default to all zero's, which is not valid.
>
> Wim
>
> On Sep 3, 2010 7:18 AM, "Andreas Vogt" <andreas.vogt@dfki.de> wrote:
> > Hi,
> >
> > after I send my robot, a starting position, he begins to turn on the
> > spot and never stops in the most cases. The odometry looks good.
> > What is causing this problem?
> > What parameters need to be adjusted?(path_distance_bias
> goal_distance_bias)
> >
> >
> > Thanks
> >
> > Andreas
>
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