I've never had much luck with Satnav on phones the GPS antenna in all the handsets I've had has been a bit crap takes a while to get a fix and can often lose it. I ended up buying a factory refurbished Mio Moove L616 for £25, problem is though it eats my bike battery quicker than the bike charges it so if I use it much more than an hour plugged in I have to bump start (as I found out in Poole on Sunday).