GPS point difference between map and reality

Hi guys,

I'm experience in some parts of the map (google earth map) differences between where vehicle really is and points in te web application. Is a fixed distance error around 200 mts. All tracks look good but with a fixed distance error around 200 mts.

What could be happening?

Thanks a lot.

You can start by checking raw data from the log to make sure location is decoded correctly.

Map datum?