If you place your SatNav in the very bottom of your windscreen, it will keep the vast majority of your windscreen unobscured.
DO NOT PLACE IT DIRECTLY IN FRONT OF YOU, THIS IS OBSCURING YOUR VIEW AND COULD BE DEEMED TO BE AN OFFENCE!
DO NOT PLACE IT ON THE SIDE WINDOW, YOU NEED TO KEEP YOUR MIRRORS CLEAR AND COULD BE DEEMED AN OFFENCE!
I place mine in the centre of the windscreen as low down as possible, it is fine here as does not obscure my vision, but all cars are different so you may need to play around with the positioning.
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