ros

The lightware SF11C (at least) outputs 130m "on lost signal" so we should handle this in the AP_LightwareSerial driver.

Here's the relevant line in the SF11 datasheet:

As mentioned b

Is your feature request related to a problem? Please describe.
Additionally to the speed of on object on which a GPS is located, I wish to know in which direction the object is moving.

Describe the solution you'd like
I would like to get the speed vector of the GPS.

Describe alternatives you've considered
I currently derivative by hand the position that the GPS return from one

Just a tip for everyone: I was having trouble running an offline cluster where the Unity Editor was the master and a remote machine was the client. The remote machine was never able to connect to the Editor, but if I ran the standalone build as the master, it connects fine.

Make sure you don't have any blocking Inbound Rules in Windows Firewall with Advanced Security for the Editor version

I recently ran into an issue using AMCL, for which I was given this warning message:

[ WARN] [1425574394.999492201]: No laser scan received (and thus no pose updates 
have been published) for 1425574394.999407 seconds.  Verify that data is being published
on the /scan topic.

However, the actual issue was a miscofiguration of the odom_frame_id :
`<param name="odom_frame_id"