Thanks for your reply, I've tried to use my gps receiver with my phone (xperia p) to check wether it makes any difference, but I can't connect it, it says that the phone "can't communicate with the gps receiver".
I did install bluetooth gps provider on my tablet as you suggested and will try it in the next days to see if there is any improvement... Is there any thing I could change in the settings to try to solve the problem, is it possible to force oruxmaps to ignore those jumps to 0° N 0° E?
greets,
euskobelga