Thanks to both, 4u2n sorry the disturbance, the problem was my drive, it does not read small cdīs, I installed another one and it can read small cdīs. It was telling me it was empty but it wasnīt.
Lot of effort to run it and I did a test, but itīs not the thing I though. I placed it below the front window and nothing, nothing and more of nothing. When I took the unit outside, perfect, it takes 4 satellites, but inside the car, nothing. And I have a Seat, the window is normal, and I have seen the same car with the same unit in the same place and working. Whatīs going wrong?
By the way (for Europeans), Mapsonic (by Michelin) is pretty, but a sh..... fuc...ng sh..t

it tooks me by the worst way to come back home, sometimes says "turn to the right" when it was showing the opposite, and the correct was the opposite, sometimes just in time... but for getting it not so expensive

jejeje.
Are your units working inside well?