No GPS fix / Windows 8.1 Dell Tablet

Hello,

I'm using Navigator free successfull on a Windows 7 PC, very nice program.

Now I've installed it on a Dell Tablet Venue 11 Pro with Intel Atom processor, Windows 8.1 and a Sierra Wireless Location Sensor.

The Sierra Wireless Location Sensor ist displayed in Navigator as "Verbundenes Gerät", but there is no "Fix", so I can't use the Navigator for navigation.

What can I do?

Thanks
racraz