The Asus Vivotab, like many new tablets, has a built-in GNSS chip for precise location information. The Windows location API uses this for detailed position data. Unfortunately, most desktop navigation and mapping programs (Streets and Trips for example) can't use the windows location platform. They need a "real" GPS with a comport.
Centrafuse Localizer solves this problem. It creates a virtual comport and translate the location platform data provided by the GNSS chip into standard NMEA 0183 protocol strings and sends them out the port to any program that needs it.
You can check it out for yourself with a free, fully functional 30-day trial.
Needless to say, I'm running Centrafuse on my VivoTab with integrated Sygic Fleet navigation and it works great.
Check it out!