Ancient jailbroken iPhone 3GS with Tom Tom, does the job fine. More importantly the phone is mounted above the clocks on a homemade bracket very much like limax2's setup below, this keeps it in constant eye view unlike when it's on the tank/handlebars etc.
[smg id=1533 type=preview align=center caption="FZS600 SatNav bracket"]
[smg id=1533 type=preview align=center caption="FZS600 SatNav bracket"]
Eagles may soar, but weasels don't get sucked into jet engines...