Well you could aways hard wire it in and then at least you could hide the cable, I myself love the challenge of getting somewhere new by using a good old fashioned map and my knowledge of the country.
It has never let me down yet but i do have nokia maps in my phone should i need it but very rarely do i use it.
All i do is have a phone cradle up by the mirror on the windscreen and the curly cable from socket to phone, Doesn't really cause me any grief doing it this way and i get to use my phone hands free as a bonus.