Good point. Forgot about that! Thanks!
That would allow you to get your GPS coordinates, but you'd still have to use your phone as a hotspot to download maps realtime.
Edit - I just took a look at the device above and this is in the description at the bottom of the screen:
"Unfortunately, the BT-821C is not compatible with Windows RT, Windows 8.1 RT or iOS Devices like iPad, iPhone or iPod Touch."